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tests: Add tests for BGP link-bandwidth and weighted ECMP

Browse Source 
Implement tests to verify BGP link-bandwidth and weighted ECMP
functionality. These tests validate one of the primary use cases for
weighted ECMP (a.k.a. Unequal cost multipath) using BGP link-bandwidth:
https://tools.ietf.org/html/draft-mohanty-bess-ebgp-dmz

The included tests are:
Test #1: Test BGP link-bandwidth advertisement based on number of multipaths
Test #2: Test cumulative link-bandwidth propagation
Test #3: Test weighted ECMP - multipath with next hop weights
Test #4: Test weighted ECMP rebalancing upon change (link flap)
Test #5: Test weighted ECMP for a second anycast IP
Test #6: Test paths with and without link-bandwidth - receiver should resort to regular ECMP
Test #7: Test different options for processing link-bandwidth on the receiver

Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
This commit is contained in:
vivek 2020-03-28 12:15:01 -07:00
parent feca4f1e67
commit 000022d205
45 changed files with 1326 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

0
tests/topotests/bgp_link_bw_ip/__init__.py Executable file
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19
tests/topotests/bgp_link_bw_ip/r1/bgp-route-1.json Normal file
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@ -0,0 +1,19 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65301:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.2"
}
]
}
]
}

32
tests/topotests/bgp_link_bw_ip/r1/bgp-route-2.json Normal file
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@ -0,0 +1,32 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"multipath":true,
"extendedCommunity":{
"string":"LB:65303:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.6"
}
]
},
{
"valid":true,
"multipath":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65201:375000 (3.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.2"
}
]
}
]
}

32
tests/topotests/bgp_link_bw_ip/r1/bgp-route-3.json Normal file
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@ -0,0 +1,32 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"multipath":true,
"extendedCommunity":{
"string":"LB:65303:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.6"
}
]
},
{
"valid":true,
"multipath":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65301:250000 (2.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.2"
}
]
}
]
}

32
tests/topotests/bgp_link_bw_ip/r1/bgp-route-4.json Normal file
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@ -0,0 +1,32 @@
{
"prefix":"198.10.1.11\/32",
"paths":[
{
"valid":true,
"multipath":true,
"extendedCommunity":{
"string":"LB:65303:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.6"
}
]
},
{
"valid":true,
"multipath":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65201:250000 (2.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.2"
}
]
}
]
}

29
tests/topotests/bgp_link_bw_ip/r1/bgp-route-5.json Normal file
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@ -0,0 +1,29 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"multipath":true,
"nexthops":[
{
"ip":"11.1.1.6"
}
]
},
{
"valid":true,
"multipath":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65201:375000 (3.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.1.2"
}
]
}
]
}

8
tests/topotests/bgp_link_bw_ip/r1/bgpd.conf Normal file
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@ -0,0 +1,8 @@
hostname r1
!
router bgp 65101
bgp router-id 11.1.1.1
bgp bestpath as-path multipath-relax
neighbor 11.1.1.2 remote-as external
neighbor 11.1.1.6 remote-as external
!

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-1.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.6",
"weight":25
},
{
"fib":true,
"ip":"11.1.1.2",
"weight":75
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-2.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.6",
"weight":33
},
{
"fib":true,
"ip":"11.1.1.2",
"weight":66
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-3.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.11\/32":[
{
"prefix":"198.10.1.11\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.6",
"weight":33
},
{
"fib":true,
"ip":"11.1.1.2",
"weight":66
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-4.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.2",
"weight":1
},
{
"fib":true,
"ip":"11.1.1.6",
"weight":1
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-5.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.11\/32":[
{
"prefix":"198.10.1.11\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.2",
"weight":1
},
{
"fib":true,
"ip":"11.1.1.6",
"weight":1
}
]
}
]
}

15
tests/topotests/bgp_link_bw_ip/r1/ip-route-6.json Normal file
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@ -0,0 +1,15 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.2",
"weight":100
}
]
}
]
}

15
tests/topotests/bgp_link_bw_ip/r1/ip-route-7.json Normal file
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@ -0,0 +1,15 @@
{
"198.10.1.11\/32":[
{
"prefix":"198.10.1.11\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.2",
"weight":100
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-8.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.6",
"weight":1
},
{
"fib":true,
"ip":"11.1.1.2",
"weight":100
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r1/ip-route-9.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.11\/32":[
{
"prefix":"198.10.1.11\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.1.6",
"weight":1
},
{
"fib":true,
"ip":"11.1.1.2",
"weight":100
}
]
}
]
}

104
tests/topotests/bgp_link_bw_ip/r1/v4_route.json Normal file
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@ -0,0 +1,104 @@
{
"10.0.1.1\/32":[
{
"prefix":"10.0.1.1\/32",
"protocol":"ospf",
"distance":110,
"metric":10,
"table":254,
"internalStatus":0,
"internalFlags":0,
"internalNextHopNum":1,
"internalNextHopActiveNum":1,
"nexthops":[
{
"flags":9,
"ip":"0.0.0.0",
"afi":"ipv4",
"interfaceIndex":2,
"interfaceName":"r1-eth0",
"active":true,
"onLink":true
}
]
},
{
"prefix":"10.0.1.1\/32",
"protocol":"connected",
"selected":true,
"destSelected":true,
"distance":0,
"metric":0,
"installed":true,
"table":254,
"internalStatus":16,
"internalFlags":8,
"internalNextHopNum":1,
"internalNextHopActiveNum":1,
"nexthops":[
{
"flags":3,
"fib":true,
"directlyConnected":true,
"interfaceIndex":2,
"interfaceName":"r1-eth0",
"active":true
}
]
}
],
"10.0.3.4\/32":[
{
"prefix":"10.0.3.4\/32",
"protocol":"connected",
"selected":true,
"destSelected":true,
"distance":0,
"metric":0,
"installed":true,
"table":254,
"internalStatus":16,
"internalFlags":8,
"internalNextHopNum":1,
"internalNextHopActiveNum":1,
"nexthops":[
{
"flags":3,
"fib":true,
"directlyConnected":true,
"interfaceIndex":3,
"interfaceName":"r1-eth1",
"active":true
}
]
}
],
"10.0.20.1\/32":[
{
"prefix":"10.0.20.1\/32",
"protocol":"ospf",
"selected":true,
"destSelected":true,
"distance":110,
"metric":20,
"installed":true,
"table":254,
"internalStatus":16,
"internalFlags":8,
"internalNextHopNum":1,
"internalNextHopActiveNum":1,
"nexthops":[
{
"flags":11,
"fib":true,
"ip":"10.0.3.2",
"afi":"ipv4",
"interfaceIndex":3,
"interfaceName":"r1-eth1",
"active":true,
"onLink":true
}
]
}
]
}

7
tests/topotests/bgp_link_bw_ip/r1/zebra.conf Normal file
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@ -0,0 +1,7 @@
!
interface r1-eth0
ip address 11.1.1.1/30
!
interface r1-eth1
ip address 11.1.1.5/30
!

15
tests/topotests/bgp_link_bw_ip/r10/bgpd.conf Normal file
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@ -0,0 +1,15 @@
hostname r10
!
ip prefix-list redist seq 10 permit 0.0.0.0/0 ge 32
!
route-map redist permit 10
match ip address prefix-list redist
!
router bgp 65354
bgp router-id 11.1.6.2
neighbor 11.1.6.1 remote-as external
!
address-family ipv4 unicast
redistribute connected route-map redist
!
!

6
tests/topotests/bgp_link_bw_ip/r10/zebra.conf Normal file
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@ -0,0 +1,6 @@
interface r10-eth0
ip address 11.1.6.2/30
!
interface r10-eth1
ip address 50.1.1.10/32
!

19
tests/topotests/bgp_link_bw_ip/r2/bgp-route-1.json Normal file
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@ -0,0 +1,19 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65301:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.2.2"
}
]
}
]
}

19
tests/topotests/bgp_link_bw_ip/r2/bgp-route-2.json Normal file
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@ -0,0 +1,19 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65301:250000 (2.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.2.2"
}
]
}
]
}

32
tests/topotests/bgp_link_bw_ip/r2/bgp-route-3.json Normal file
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@ -0,0 +1,32 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"multipath":true,
"extendedCommunity":{
"string":"LB:65302:125000 (1.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.2.6"
}
]
},
{
"valid":true,
"multipath":true,
"bestpath":{
"overall":true
},
"extendedCommunity":{
"string":"LB:65301:250000 (2.000 Mbps)"
},
"nexthops":[
{
"ip":"11.1.2.2"
}
]
}
]
}

9
tests/topotests/bgp_link_bw_ip/r2/bgpd.conf Normal file
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@ -0,0 +1,9 @@
hostname r2
!
router bgp 65201
bgp router-id 11.1.2.1
bgp bestpath as-path multipath-relax
neighbor 11.1.1.1 remote-as external
neighbor 11.1.2.2 remote-as external
neighbor 11.1.2.6 remote-as external
!

19
tests/topotests/bgp_link_bw_ip/r2/ip-route-1.json Normal file
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@ -0,0 +1,19 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"protocol":"bgp",
"selected":true,
"installed":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.2.2",
"interfaceName":"r2-eth1",
"active":true,
"weight":1
}
]
}
]
}

20
tests/topotests/bgp_link_bw_ip/r2/ip-route-2.json Normal file
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@ -0,0 +1,20 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.2.6",
"weight":33
},
{
"fib":true,
"ip":"11.1.2.2",
"weight":66
}
]
}
]
}

15
tests/topotests/bgp_link_bw_ip/r2/ip-route-3.json Normal file
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@ -0,0 +1,15 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.2.2",
"weight":1
}
]
}
]
}

10
tests/topotests/bgp_link_bw_ip/r2/zebra.conf Normal file
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@ -0,0 +1,10 @@
!
interface r2-eth0
ip address 11.1.1.2/30
!
interface r2-eth1
ip address 11.1.2.1/30
!
interface r2-eth2
ip address 11.1.2.5/30
!

8
tests/topotests/bgp_link_bw_ip/r3/bgpd.conf Normal file
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@ -0,0 +1,8 @@
hostname r3
!
router bgp 65202
bgp router-id 11.1.3.1
bgp bestpath as-path multipath-relax
neighbor 11.1.1.5 remote-as external
neighbor 11.1.3.2 remote-as external
!

7
tests/topotests/bgp_link_bw_ip/r3/zebra.conf Normal file
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@ -0,0 +1,7 @@
!
interface r3-eth0
ip address 11.1.1.6/30
!
interface r3-eth1
ip address 11.1.3.1/30
!

23
tests/topotests/bgp_link_bw_ip/r4/bgp-route-1.json Normal file
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@ -0,0 +1,23 @@
{
"prefix":"198.10.1.1\/32",
"paths":[
{
"valid":true,
"multipath":true,
"nexthops":[
{
"ip":"11.1.4.6"
}
]
},
{
"valid":true,
"multipath":true,
"nexthops":[
{
"ip":"11.1.4.2"
}
]
}
]
}

28
tests/topotests/bgp_link_bw_ip/r4/bgpd.conf Normal file
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@ -0,0 +1,28 @@
!
log file bgpd.log
!
debug bgp updates
debug bgp zebra
debug bgp bestpath 198.10.1.1/32
!
hostname r4
!
ip prefix-list anycast_ip seq 10 permit 198.10.1.0/24 le 32
!
route-map anycast_ip permit 10
match ip address prefix-list anycast_ip
set extcommunity bandwidth num-multipaths
!
route-map anycast_ip permit 20
!
router bgp 65301
bgp router-id 11.1.4.1
bgp bestpath as-path multipath-relax
neighbor 11.1.2.1 remote-as external
neighbor 11.1.4.2 remote-as external
neighbor 11.1.4.6 remote-as external
!
address-family ipv4 unicast
neighbor 11.1.2.1 route-map anycast_ip out
!
!

21
tests/topotests/bgp_link_bw_ip/r4/ip-route-1.json Normal file
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@ -0,0 +1,21 @@
{
"198.10.1.1\/32":[
{
"prefix":"198.10.1.1\/32",
"protocol":"bgp",
"selected":true,
"nexthops":[
{
"fib":true,
"ip":"11.1.4.2",
"weight":1
},
{
"fib":true,
"ip":"11.1.4.6",
"weight":1
}
]
}
]
}

10
tests/topotests/bgp_link_bw_ip/r4/zebra.conf Normal file
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@ -0,0 +1,10 @@
!
interface r4-eth0
ip address 11.1.2.2/30
!
interface r4-eth1
ip address 11.1.4.1/30
!
interface r4-eth2
ip address 11.1.4.5/30
!

20
tests/topotests/bgp_link_bw_ip/r5/bgpd.conf Normal file
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@ -0,0 +1,20 @@
hostname r5
!
ip prefix-list anycast_ip seq 10 permit 198.10.1.0/24 le 32
!
route-map anycast_ip permit 10
match ip address prefix-list anycast_ip
set extcommunity bandwidth num-multipaths
!
route-map anycast_ip permit 20
!
router bgp 65302
bgp router-id 11.1.5.1
bgp bestpath as-path multipath-relax
neighbor 11.1.2.5 remote-as external
neighbor 11.1.5.2 remote-as external
!
address-family ipv4 unicast
neighbor 11.1.2.5 route-map anycast_ip out
!
!

7
tests/topotests/bgp_link_bw_ip/r5/zebra.conf Normal file
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@ -0,0 +1,7 @@
!
interface r5-eth0
ip address 11.1.2.6/30
!
interface r5-eth1
ip address 11.1.5.1/30
!

20
tests/topotests/bgp_link_bw_ip/r6/bgpd.conf Normal file
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@ -0,0 +1,20 @@
hostname r6
!
ip prefix-list anycast_ip seq 10 permit 198.10.1.0/24 le 32
!
route-map anycast_ip permit 10
match ip address prefix-list anycast_ip
set extcommunity bandwidth num-multipaths
!
route-map anycast_ip permit 20
!
router bgp 65303
bgp router-id 11.1.6.1
bgp bestpath as-path multipath-relax
neighbor 11.1.3.1 remote-as external
neighbor 11.1.6.2 remote-as external
!
address-family ipv4 unicast
neighbor 11.1.3.1 route-map anycast_ip out
!
!

7
tests/topotests/bgp_link_bw_ip/r6/zebra.conf Normal file
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@ -0,0 +1,7 @@
!
interface r6-eth0
ip address 11.1.3.2/30
!
interface r6-eth1
ip address 11.1.6.1/30
!

15
tests/topotests/bgp_link_bw_ip/r7/bgpd.conf Normal file
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@ -0,0 +1,15 @@
hostname r7
!
ip prefix-list redist seq 10 permit 0.0.0.0/0 ge 32
!
route-map redist permit 10
match ip address prefix-list redist
!
router bgp 65351
bgp router-id 11.1.4.2
neighbor 11.1.4.1 remote-as external
!
address-family ipv4 unicast
redistribute connected route-map redist
!
!

6
tests/topotests/bgp_link_bw_ip/r7/zebra.conf Normal file
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@ -0,0 +1,6 @@
interface r7-eth0
ip address 11.1.4.2/30
!
interface r7-eth1
ip address 50.1.1.7/32
!

15
tests/topotests/bgp_link_bw_ip/r8/bgpd.conf Normal file
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@ -0,0 +1,15 @@
hostname r8
!
ip prefix-list redist seq 10 permit 0.0.0.0/0 ge 32
!
route-map redist permit 10
match ip address prefix-list redist
!
router bgp 65352
bgp router-id 11.1.4.6
neighbor 11.1.4.5 remote-as external
!
address-family ipv4 unicast
redistribute connected route-map redist
!
!

6
tests/topotests/bgp_link_bw_ip/r8/zebra.conf Normal file
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@ -0,0 +1,6 @@
interface r8-eth0
ip address 11.1.4.6/30
!
interface r8-eth1
ip address 50.1.1.8/32
!

15
tests/topotests/bgp_link_bw_ip/r9/bgpd.conf Normal file
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@ -0,0 +1,15 @@
hostname r9
!
ip prefix-list redist seq 10 permit 0.0.0.0/0 ge 32
!
route-map redist permit 10
match ip address prefix-list redist
!
router bgp 65353
bgp router-id 11.1.5.2
neighbor 11.1.5.1 remote-as external
!
address-family ipv4 unicast
redistribute connected route-map redist
!
!

6
tests/topotests/bgp_link_bw_ip/r9/zebra.conf Normal file
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@ -0,0 +1,6 @@
interface r9-eth0
ip address 11.1.5.2/30
!
interface r9-eth1
ip address 50.1.1.9/32
!

515
tests/topotests/bgp_link_bw_ip/test_bgp_linkbw_ip.py Executable file
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@ -0,0 +1,515 @@
#!/usr/bin/env python
#
# test_bgp_linkbw_ip.py
#
# Copyright (c) 2020 by
# Cumulus Networks, Inc
# Vivek Venkatraman
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#
"""
test_bgp_linkbw_ip.py: Test weighted ECMP using BGP link-bandwidth
"""
import os
import re
import sys
from functools import partial
import pytest
import json
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, '../'))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger
# Required to instantiate the topology builder class.
from mininet.topo import Topo
"""
This topology is for validating one of the primary use cases for
weighted ECMP (a.k.a. Unequal cost multipath) using BGP link-bandwidth:
https://tools.ietf.org/html/draft-mohanty-bess-ebgp-dmz
The topology consists of two PODs. Pod-1 consists of a spine switch
and two leaf switches, with two servers attached to the first leaf and
one to the second leaf. Pod-2 consists of one spine and one leaf, with
one server connected to the leaf. The PODs are connected by a super-spine
switch.
Note that the use of the term "switch" above is in keeping with common
data-center terminology. These devices are all regular routers; for
this scenario, the servers are also routers as they have to announce
anycast IP (VIP) addresses via BGP.
"""
class BgpLinkBwTopo(Topo):
"Test topology builder"
def build(self, *_args, **_opts):
"Build function"
tgen = get_topogen(self)
# Create 10 routers - 1 super-spine, 2 spines, 3 leafs
# and 4 servers
routers = {}
for i in range(1, 11):
routers[i] = tgen.add_router('r{}'.format(i))
# Create 13 "switches" - to interconnect the above routers
switches = {}
for i in range(1, 14):
switches[i] = tgen.add_switch('s{}'.format(i))
# Interconnect R1 (super-spine) to R2 and R3 (the two spines)
switches[1].add_link(tgen.gears['r1'])
switches[1].add_link(tgen.gears['r2'])
switches[2].add_link(tgen.gears['r1'])
switches[2].add_link(tgen.gears['r3'])
# Interconnect R2 (spine in pod-1) to R4 and R5 (the associated
# leaf switches)
switches[3].add_link(tgen.gears['r2'])
switches[3].add_link(tgen.gears['r4'])
switches[4].add_link(tgen.gears['r2'])
switches[4].add_link(tgen.gears['r5'])
# Interconnect R3 (spine in pod-2) to R6 (associated leaf)
switches[5].add_link(tgen.gears['r3'])
switches[5].add_link(tgen.gears['r6'])
# Interconnect leaf switches to servers
switches[6].add_link(tgen.gears['r4'])
switches[6].add_link(tgen.gears['r7'])
switches[7].add_link(tgen.gears['r4'])
switches[7].add_link(tgen.gears['r8'])
switches[8].add_link(tgen.gears['r5'])
switches[8].add_link(tgen.gears['r9'])
switches[9].add_link(tgen.gears['r6'])
switches[9].add_link(tgen.gears['r10'])
# Create empty networks for the servers
switches[10].add_link(tgen.gears['r7'])
switches[11].add_link(tgen.gears['r8'])
switches[12].add_link(tgen.gears['r9'])
switches[13].add_link(tgen.gears['r10'])
def setup_module(mod):
"Sets up the pytest environment"
tgen = Topogen(BgpLinkBwTopo, mod.__name__)
tgen.start_topology()
router_list = tgen.routers()
for rname, router in router_list.iteritems():
router.load_config(
TopoRouter.RD_ZEBRA,
os.path.join(CWD, '{}/zebra.conf'.format(rname))
)
router.load_config(
TopoRouter.RD_BGP,
os.path.join(CWD, '{}/bgpd.conf'.format(rname))
)
# Initialize all routers.
tgen.start_router()
#tgen.mininet_cli()
def teardown_module(mod):
"Teardown the pytest environment"
tgen = get_topogen()
tgen.stop_topology()
def test_bgp_linkbw_adv():
"Test #1: Test BGP link-bandwidth advertisement based on number of multipaths"
logger.info('\nTest #1: Test BGP link-bandwidth advertisement based on number of multipaths')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
r2 = tgen.gears['r2']
# Configure anycast IP on server r7
logger.info('Configure anycast IP on server r7')
tgen.net['r7'].cmd('ip addr add 198.10.1.1/32 dev r7-eth1')
# Check on spine router r2 for link-bw advertisement by leaf router r4
logger.info('Check on spine router r2 for link-bw advertisement by leaf router r4')
json_file = '{}/r2/bgp-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
# Check on spine router r2 that default weight is used as there is no multipath
logger.info('Check on spine router r2 that default weight is used as there is no multipath')
json_file = '{}/r2/ip-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
# Check on super-spine router r1 that link-bw has been propagated by spine router r2
logger.info('Check on super-spine router r1 that link-bw has been propagated by spine router r2')
json_file = '{}/r1/bgp-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
def test_bgp_cumul_linkbw():
"Test #2: Test cumulative link-bandwidth propagation"
logger.info('\nTest #2: Test cumulative link-bandwidth propagation')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
r2 = tgen.gears['r2']
r4 = tgen.gears['r4']
# Configure anycast IP on additional server r8
logger.info('Configure anycast IP on server r8')
tgen.net['r8'].cmd('ip addr add 198.10.1.1/32 dev r8-eth1')
# Check multipath on leaf router r4
logger.info('Check multipath on leaf router r4')
json_file = '{}/r4/bgp-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r4, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on leaf router r4'
assert result is None, assertmsg
# Check regular ECMP is in effect on leaf router r4
logger.info('Check regular ECMP is in effect on leaf router r4')
json_file = '{}/r4/ip-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r4, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on leaf router r4'
assert result is None, assertmsg
# Check on spine router r2 that leaf has propagated the cumulative link-bw based on num-multipaths
logger.info('Check on spine router r2 that leaf has propagated the cumulative link-bw based on num-multipaths')
json_file = '{}/r2/bgp-route-2.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
def test_weighted_ecmp():
"Test #3: Test weighted ECMP - multipath with next hop weights"
logger.info('\nTest #3: Test weighted ECMP - multipath with next hop weights')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
r2 = tgen.gears['r2']
# Configure anycast IP on additional server r9
logger.info('Configure anycast IP on server r9')
tgen.net['r9'].cmd('ip addr add 198.10.1.1/32 dev r9-eth1')
# Check multipath on spine router r2
logger.info('Check multipath on spine router r2')
json_file = '{}/r2/bgp-route-3.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
# Check weighted ECMP is in effect on the spine router r2
logger.info('Check weighted ECMP is in effect on the spine router r2')
json_file = '{}/r2/ip-route-2.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
# Configure anycast IP on additional server r10
logger.info('Configure anycast IP on server r10')
tgen.net['r10'].cmd('ip addr add 198.10.1.1/32 dev r10-eth1')
# Check multipath on super-spine router r1
logger.info('Check multipath on super-spine router r1')
json_file = '{}/r1/bgp-route-2.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
# Check weighted ECMP is in effect on the super-spine router r1
logger.info('Check weighted ECMP is in effect on the super-spine router r1')
json_file = '{}/r1/ip-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
def test_weighted_ecmp_link_flap():
"Test #4: Test weighted ECMP rebalancing upon change (link flap)"
logger.info('\nTest #4: Test weighted ECMP rebalancing upon change (link flap)')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
r2 = tgen.gears['r2']
# Bring down link on server r9
logger.info('Bring down link on server r9')
tgen.net['r9'].cmd('ip link set dev r9-eth1 down')
# Check spine router r2 has only one path
logger.info('Check spine router r2 has only one path')
json_file = '{}/r2/ip-route-3.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r2, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on spine router r2'
assert result is None, assertmsg
# Check link-bandwidth change and weighted ECMP rebalance on super-spine router r1
logger.info('Check link-bandwidth change and weighted ECMP rebalance on super-spine router r1')
json_file = '{}/r1/bgp-route-3.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-2.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
# Bring up link on server r9
logger.info('Bring up link on server r9')
tgen.net['r9'].cmd('ip link set dev r9-eth1 up')
# Check link-bandwidth change and weighted ECMP rebalance on super-spine router r1
logger.info('Check link-bandwidth change and weighted ECMP rebalance on super-spine router r1')
json_file = '{}/r1/bgp-route-2.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-1.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
def test_weighted_ecmp_second_anycast_ip():
"Test #5: Test weighted ECMP for a second anycast IP"
logger.info('\nTest #5: Test weighted ECMP for a second anycast IP')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
r2 = tgen.gears['r2']
# Configure anycast IP on additional server r7, r9 and r10
logger.info('Configure anycast IP on server r7, r9 and r10')
tgen.net['r7'].cmd('ip addr add 198.10.1.11/32 dev r7-eth1')
tgen.net['r9'].cmd('ip addr add 198.10.1.11/32 dev r9-eth1')
tgen.net['r10'].cmd('ip addr add 198.10.1.11/32 dev r10-eth1')
# Check link-bandwidth and weighted ECMP on super-spine router r1
logger.info('Check link-bandwidth and weighted ECMP on super-spine router r1')
json_file = '{}/r1/bgp-route-4.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.11/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-3.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.11/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
def test_paths_with_and_without_linkbw():
"Test #6: Test paths with and without link-bandwidth - receiver should resort to regular ECMP"
logger.info('\nTest #6: Test paths with and without link-bandwidth - receiver should resort to regular ECMP')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
# Configure leaf router r6 to not advertise any link-bandwidth
logger.info('Configure leaf router r6 to not advertise any link-bandwidth')
tgen.net['r6'].cmd('vtysh -c \"conf t\" -c \"router bgp 65303\" -c \"address-family ipv4 unicast\" -c \"no neighbor 11.1.3.1 route-map anycast_ip out\"')
# Check link-bandwidth change on super-spine router r1
logger.info('Check link-bandwidth change on super-spine router r1')
json_file = '{}/r1/bgp-route-5.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show bgp ipv4 uni 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
# Check super-spine router r1 resorts to regular ECMP
logger.info('Check super-spine router r1 resorts to regular ECMP')
json_file = '{}/r1/ip-route-4.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-5.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.11/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=50, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
def test_linkbw_handling_options():
"Test #7: Test different options for processing link-bandwidth on the receiver"
logger.info('\nTest #7: Test different options for processing link-bandwidth on the receiver')
tgen = get_topogen()
if tgen.routers_have_failure():
pytest.skip('skipped because of router(s) failure')
r1 = tgen.gears['r1']
# Configure super-spine r1 to skip multipaths without link-bandwidth
logger.info('Configure super-spine r1 to skip multipaths without link-bandwidth')
tgen.net['r1'].cmd('vtysh -c \"conf t\" -c \"router bgp 65101\" -c \"bgp bestpath bandwidth skip-missing\"')
# Check super-spine router r1 resorts to only one path as other path is skipped
logger.info('Check super-spine router r1 resorts to only one path as other path is skipped')
json_file = '{}/r1/ip-route-6.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-7.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.11/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
# Configure super-spine r1 to use default-weight for multipaths without link-bandwidth
logger.info('Configure super-spine r1 to use default-weight for multipaths without link-bandwidth')
tgen.net['r1'].cmd('vtysh -c \"conf t\" -c \"router bgp 65101\" -c \"bgp bestpath bandwidth default-weight-for-missing\"')
# Check super-spine router r1 uses ECMP with weight 1 for path without link-bandwidth
logger.info('Check super-spine router r1 uses ECMP with weight 1 for path without link-bandwidth')
json_file = '{}/r1/ip-route-8.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.1/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
json_file = '{}/r1/ip-route-9.json'.format(CWD)
expected = json.loads(open(json_file).read())
test_func = partial(topotest.router_json_cmp,
r1, 'show ip route 198.10.1.11/32 json', expected)
_, result = topotest.run_and_expect(test_func, None, count=200, wait=0.5)
assertmsg = 'JSON output mismatch on super-spine router r1'
assert result is None, assertmsg
if __name__ == '__main__':
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))