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Merge pull request #4962 from donaldsharp/large_admin_distance_tests
Large admin distance tests and documentation
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commit
ec8a965eed
@ -292,6 +292,62 @@ Link Parameters Commands
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.. _zebra-vrf:
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.. _zebra-vrf:
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Administrative Distance
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=======================
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Administrative distance allows FRR to make decisions about what routes
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should be installed in the rib based upon the originating protocol.
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The lowest Admin Distance is the route selected. This is purely a
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subjective decision about ordering and care has been taken to choose
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the same distances that other routing suites have choosen.
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+------------+-----------+
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| Protocol | Distance |
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+------------+-----------+
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| System | 0 |
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+------------+-----------+
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| Kernel | 0 |
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+------------+-----------+
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| Connect | 0 |
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+------------+-----------+
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| Static | 1 |
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+------------+-----------+
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| NHRP | 10 |
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+------------+-----------+
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| EBGP | 20 |
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+------------+-----------+
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| EIGRP | 90 |
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+------------+-----------+
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| BABEL | 100 |
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+------------+-----------+
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| OSPF | 110 |
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+------------+-----------+
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| ISIS | 115 |
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+------------+-----------+
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| OPENFABRIC | 115 |
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+------------+-----------+
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| RIP | 120 |
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+------------+-----------+
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| Table | 150 |
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+------------+-----------+
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| SHARP | 150 |
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+------------+-----------+
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| IBGP | 200 |
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+------------+-----------+
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| PBR | 200 |
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+------------+-----------+
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An admin distance of 255 indicates to Zebra that the route should not be
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installed into the Data Plane. Additionally routes with an admin distance
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of 255 will not be redistributed.
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Zebra does treat Kernel routes as special case for the purposes of Admin
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Distance. Upon learning about a route that is not originated by FRR
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we read the metric value as a uint32_t. The top byte of the value
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is interpreted as the Administrative Distance and the low three bytes
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are read in as the metric. This special case is to facilitate VRF
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default routes.
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Virtual Routing and Forwarding
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Virtual Routing and Forwarding
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==============================
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==============================
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@ -15,6 +15,7 @@ S>* 4.5.6.11/32 [1/0] via 192.168.0.2, r1-eth0, XX:XX:XX
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S>* 4.5.6.12/32 [1/0] is directly connected, r1-eth0, XX:XX:XX
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S>* 4.5.6.12/32 [1/0] is directly connected, r1-eth0, XX:XX:XX
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S>* 4.5.6.13/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.13/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.14/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.14/32 [1/0] unreachable (blackhole), XX:XX:XX
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S 4.5.6.15/32 [255/0] via 192.168.0.2, r1-eth0, XX:XX:XX
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S>* 4.5.6.7/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.7/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.8/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.8/32 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4.5.6.9/32 [1/0] unreachable (ICMP unreachable), XX:XX:XX
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S>* 4.5.6.9/32 [1/0] unreachable (ICMP unreachable), XX:XX:XX
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@ -20,9 +20,10 @@ C * fe80::/64 is directly connected, r1-eth7, XX:XX:XX
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C * fe80::/64 is directly connected, r1-eth8, XX:XX:XX
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C * fe80::/64 is directly connected, r1-eth8, XX:XX:XX
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C * fe80::/64 is directly connected, r1-eth9, XX:XX:XX
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C * fe80::/64 is directly connected, r1-eth9, XX:XX:XX
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O fc00:0:0:4::/64 [110/10] is directly connected, r1-eth4, XX:XX:XX
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O fc00:0:0:4::/64 [110/10] is directly connected, r1-eth4, XX:XX:XX
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S>* 4:5::/32 [1/0] is directly connected, r1-eth0, XX:XX:XX
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S>* 4:5::6:10/128 [1/0] via fc00::2, r1-eth0, XX:XX:XX
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S>* 4:5::6:10/128 [1/0] via fc00::2, r1-eth0, XX:XX:XX
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S>* 4:5::6:11/128 [1/0] via fc00::2, r1-eth0, XX:XX:XX
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S>* 4:5::6:11/128 [1/0] via fc00::2, r1-eth0, XX:XX:XX
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S>* 4:5::6:12/128 [1/0] is directly connected, r1-eth0, XX:XX:XX
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S 4:5::6:15/128 [255/0] via fc00::2, r1-eth0, XX:XX:XX
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S>* 4:5::6:7/128 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4:5::6:7/128 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4:5::6:8/128 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4:5::6:8/128 [1/0] unreachable (blackhole), XX:XX:XX
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S>* 4:5::6:9/128 [1/0] unreachable (ICMP unreachable), XX:XX:XX
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S>* 4:5::6:9/128 [1/0] unreachable (ICMP unreachable), XX:XX:XX
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@ -20,7 +20,12 @@ ip route 4.5.6.11/32 192.168.0.2 r1-eth0
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ipv6 route 4:5::6:11/128 fc00:0:0:0::2 r1-eth0
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ipv6 route 4:5::6:11/128 fc00:0:0:0::2 r1-eth0
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# Create ifname routes
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# Create ifname routes
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ip route 4.5.6.12/32 r1-eth0
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ip route 4.5.6.12/32 r1-eth0
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ipv6 route 4:5::6:12/32 r1-eth0
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ipv6 route 4:5::6:12/128 r1-eth0
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# Create a route that has a large admin distance
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# an admin distance of 255 should be accepted
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# by zebra but not installed.
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ip route 4.5.6.15/32 192.168.0.2 255
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ipv6 route 4:5::6:15/128 fc00:0:0:0::2 255
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!
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!
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interface r1-eth0
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interface r1-eth0
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description to sw0 - no routing protocol
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description to sw0 - no routing protocol
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