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vxlan: increase mtu to 1550

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vxlan encapsulation have 50 bytes overhead,so we need to increase
mtu on physical interfaces to avoid fragmentation.
This commit is contained in:
Alexandre Derumier 2018-08-22 08:33:16 +02:00 committed by Wolfgang Bumiller
parent 83c80b5d9a
commit 47cf2d10c2
1 changed files with 30 additions and 1 deletions
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29
vxlan-and-evpn.adoc
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@ -16,6 +16,9 @@ while accommodating a very large number of tenants. It is defined in RFC 7348.
Each overlay network is known as a VXLAN Segment and identified by a unique Each overlay network is known as a VXLAN Segment and identified by a unique
24-bit segment ID called a VXLAN Network Identifier (VNI). 24-bit segment ID called a VXLAN Network Identifier (VNI).
VXLAN encapsulation add 50bytes overhead, so you need to increase mtu on your host
physical interfaces to 1550 at minimum. (or decrease mtu inside your vms to 1450)
For BUM traffic (broadcast / unknown unicast traffic, multicast), For BUM traffic (broadcast / unknown unicast traffic, multicast),
we have 3 differents vxlan setup modes : multicast, unicast, bgp-evpn we have 3 differents vxlan setup modes : multicast, unicast, bgp-evpn
@ -36,6 +39,7 @@ remote VTEPs will get the packet and answer accordingly direct to the originatin
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -74,6 +78,7 @@ iface vmbr3 inet manual
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -113,6 +118,7 @@ iface vmbr3 inet manual
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -161,6 +167,7 @@ The VXLAN device will still learn remote addresses automatically using source-ad
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -203,6 +210,7 @@ iface vmbr3 inet manual
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -244,6 +252,7 @@ iface vmbr3 inet manual
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -296,6 +305,7 @@ it's possible to use external bgp route reflector servers.
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -363,6 +373,7 @@ line vty
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -429,6 +440,7 @@ line vty
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -526,6 +538,7 @@ net.ipv6.conf.all.forwarding=1
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -600,6 +613,7 @@ line vty
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -674,6 +688,7 @@ line vty
---- ----
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -779,6 +794,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -888,6 +904,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -998,6 +1015,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1118,6 +1136,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1237,6 +1256,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1347,6 +1367,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1465,6 +1486,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1479,6 +1501,7 @@ iface eno2
address 172.16.0.1 address 172.16.0.1
netmask 255.255.255.0 netmask 255.255.255.0
vrf vrf1 vrf vrf1
mtu 1550
post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1 post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1
#if you have multiple external routers, you can use ecmp balancing #if you have multiple external routers, you can use ecmp balancing
#post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1 #post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1
@ -1584,6 +1607,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1598,6 +1622,7 @@ iface eno2
address 172.16.0.3 address 172.16.0.3
netmask 255.255.255.0 netmask 255.255.255.0
vrf vrf1 vrf vrf1
mtu 1550
post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1 post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1
#if you have multiple external routers, you can use ecmp balancing #if you have multiple external routers, you can use ecmp balancing
#post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1 #post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1
@ -1704,6 +1729,7 @@ iface vrf1
auto eno1 auto eno1
iface eno1 inet manual iface eno1 inet manual
mtu 1550
auto vmbr0 auto vmbr0
iface vmbr0 inet static iface vmbr0 inet static
@ -1718,6 +1744,7 @@ iface eno2
address 172.16.0.3 address 172.16.0.3
netmask 255.255.255.0 netmask 255.255.255.0
vrf vrf1 vrf vrf1
mtu 1550
post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1 post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1
#if you have multiple external routers, you can use ecmp balancing #if you have multiple external routers, you can use ecmp balancing
#post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1 #post-up route add default nexthop via 172.16.0.253 dev eno2 vrf vrf1 nexthop via 172.16.0.254 dev eno2 vrf vrf1
@ -1832,6 +1859,7 @@ iface eno2
address 172.16.0.1 address 172.16.0.1
netmask 255.255.255.0 netmask 255.255.255.0
vrf vrf1 vrf vrf1
mtu 1550
post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1 post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1
vrrp-id 1 vrrp-id 1
vrrp-priority 1 vrrp-priority 1
@ -1845,6 +1873,7 @@ auto eno2
iface eno2 iface eno2
address 172.16.0.2 address 172.16.0.2
netmask 255.255.255.0 netmask 255.255.255.0
mtu 1550
vrf vrf1 vrf vrf1
post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1 post-up ip route add default via 172.16.0.254 dev eno2 vrf vrf1
vrrp-id 1 vrrp-id 1