Last updated: 11-Feb-2003 Command Feature default route: usually route into the network cloud static route: usually route toward the hub static routes are classless
Stop advertising network To suppress networks from being advertised in updates router rip network 172.16.0.0 distribute-list 1 out serial 1 Only 1 in list and only 1 out list per routing protocol or per routing/interface
access-list 1 deny 172.16.8.0 0.0.0.255 Stop the network 172.16.8.0 from being advertised by RIP, out of s1 only access-list 1 permit any
Control which network is redistributed & advertised router rip network 172.16.0.0 redistribute ospf 10 metric 4 distribute-list 1 out ospf 10 Do not allow advertising of routes coming from OPSF 10 out: out from OSPF 10 access-list 1 deny 192.168.8.0 0.0.0.255 Stop the network 192.168.8.0 from being redistributed from OPSF to RIP access-list 1 permit any
To filter networks received in updates Only works properly with distance-vector protocols router rip network 172.16.0.0 distribute-list 1 in serial1 Deny 192.168.8.0 if it arrive from Serial1 Won't be processed by RIP access-list 1 deny 192.168.8.0 0.0.0.255 Stop the network 192.168.8.0 from being redistributed from OPSF to RIP access-list 1 permit any
Split horizon Split-horizon is a layer 2 behavior, knows nothing of layer 3 no ip split-horizon Disable split-horizon on multipoint interface when hub & spoke and classful [RIP...], if spokes need to talk to each other/receive routing updated from each others Only affect RIP for not EIGRP, need: NO IP SPLIT-HORIZON EIGRP X Must be disabled on interfaces with secondary addresses or secondary address will not be advertised EIGRP does not use split-horizon when advertising routes learned through redistribution This not affected by ip split-horizon eigrp
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