O ODR não deve ser encarado como um protocolo de routing mas sim uma extensão ao Cisco CDP. Através das mensagens recebidas do CDP de um neighbor, como o prefix/mask, pode assim redistribuir estas redes em processos de routing. O ODR suporta Variable Length Subnet Mask (VLSM). Ao ativar o ODR os neighbors são “vistos” como stub, recebendo a default route.
AD=160
Timers: Updates a cada 60 segundos, Invalid 180 segundos, flushed 240 segundos
Exemplo:
Ligações:
R2-f0/1—–f0/0-R3
R2#
*Mar 1 14:45:22.532: CDP-IP: Writing default route 192.168.20.2 for FastEthernet0/1
*Mar 1 14:45:36.116: CDP-IP: Reading prefix 10.100.100.0/24 source 192.168.20.1 via FastEthernet0/1
*Mar 1 14:45:36.120: CDP-IP: Updating prefix 10.100.100.0/24 in routing table
*Mar 1 14:45:36.124: CDP-IP: Reading prefix 10.100.200.0/24 source 192.168.20.1 via FastEthernet0/1
*Mar 1 14:45:36.124: CDP-IP: Updating prefix 10.100.200.0/24 in routing table
R2#
*Mar 1 14:45:39.956: CDP-IP: Aging routes
R2#sh ip route od
10.0.0.0/24 is subnetted, 3 subnets
o 10.100.100.0 [160/1] via 192.168.20.1, 00:00:07, FastEthernet0/1
o 10.100.200.0 [160/1] via 192.168.20.1, 00:00:07, FastEthernet0/1
R2(config)#
router ospf 1
redistribute odr subnets
router odr
redistribute ospf 1
redistribution of “ospf” via “odr” not allowe
R2#sh ip pro
Routing Protocol is “odr”
Sending updates every 60 seconds, next due in 56 seconds
Invalid after 180 seconds, hold down 0, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Maximum path: 4
Routing Information Sources:
Gateway Distance Last Update
192.168.20.1 160 00:00:07
Distance: (default is 160)
R3#sh ip int br
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.20.1 YES manual up up
Loopback1 10.100.100.1 YES manual up up
Loopback2 10.100.200.1 YES manual up up
R3#sh ip ro od
o* 0.0.0.0/0 [160/1] via 192.168.20.2, 00:00:07, FastEthernet0/0