From: Aaron DuShey (aaron.dushey@xxxxxxxxxxxxxxxxxxxxx)
Date: Sat Sep 09 2000 - 18:39:58 GMT-3
as3---r6---r5----r1-----as1
172.168.80.x as2 172.168.70.x
OSPF is running only on r5
r1 & r6 are doing mutal redistribution and running both ospf & bgp
Looking at the results below my redistribution filtering isn't working as
planned
I want to make sure I understand what's happening here clearly-can someone
verify please?
r1 is redistibuting route 172.168.80.x in from BGP into OSPF, r6 ospf then
adv to r5, r5ospf adv to r1 and BGP route is removed. BGP route is then
re-entered, and loop is formed.
Am I correct in saying this happens with type 5 (External) only since they
are treated in a distance vector sort of manner in which they are advertised
by next-hops vs the normal LS behaviour of flooding?
thanks,
01:43:00: RT: add 172.168.80.0/24 via 137.20.60.1, bgp metric [200/0]
01:43:05: RT: closer admin distance for 172.168.80.0, flushing 1 routes
01:43:05: RT: add 172.168.80.0/24 via 137.20.25.2, ospf metric [110/30]
01:43:10: OSPF: Rcv hello from 137.20.224.5 area 2 from Ethernet0/0
137.20.25.2
01:43:10: OSPF: End of hello processing
01:43:11: RT: del 172.168.80.0/24 via 137.20.25.2, ospf metric [110/30]
01:43:11: RT: delete subnet route to 172.168.80.0/24
01:43:13: RT: add 172.168.80.0/24 via 137.20.60.1, bgp metric [200/0]
01:43:16: RT: closer admin distance for 172.168.80.0, flushing 1 routes
01:43:16: RT: add 172.168.80.0/24 via 137.20.25.2, ospf metric [110/30]
01:43:20: OSPF: Rcv hello from 137.20.224.5 area 2 from Ethernet0/0
137.20.25.2
01:43:20: OSPF: End of hello processing
01:43:21: RT: del 172.168.80.0/24 via 137.20.25.2, ospf metric [110/30]
01:43:21: RT: delete subnet route to 172.168.80.0/24
01:43:23: RT: add 172.168.80.0/24 via 137.20.60.1, bgp metric [200/0]
01:43:26: RT: closer admin distance for 172.168.80.0, flushing 1 routes
01:43:26: RT: add 172.168.80.0/24 via 137.20.25.2, ospf metric [110/30]
01:43:30: OSPF: Rcv hello from 137.20.224.5 area 2 from Ethernet0/0
137.20.25.2
01:43:30: OSPF: End of hello processing
Aaron DuShey
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