10-11-2006 09:02 AM - edited 03-05-2019 12:11 PM
Hi,
I have attached a diagram of the topology.
I suppose I am having a problem with routing loop but I cannot figure out how is it occuring and the solution of course
This is the config of the routers as far as the redistribution is concerned. All connectivities are in place.
Router 1
router ospf 1
router-id 150.1.1.1
log-adjacency-changes
network 132.1.0.0 0.0.0.255 area 0
network 132.1.17.0 0.0.0.255 area 17
network 150.1.1.1 0.0.0.0 area 0
Router 2 -
router eigrp 10
redistribute ospf 1 metric 10000 100 1 255 1500
network 132.1.26.0 0.0.0.255
network 150.2.2.2 0.0.0.0
neighbor 132.1.26.6 Ethernet0/0
no auto-summary
eigrp router-id 150.2.2.2
router ospf 1
router-id 150.2.2.2
log-adjacency-changes
redistribute eigrp 10 metric 20 subnets
network 132.1.0.0 0.0.0.255 area 0
network 150.2.2.2 0.0.0.0 area 0
Router 3
router eigrp 10
router-id 150.3.3.3
redistribute ospf 1 metric 10000 100 1 255 1500
network 132.1.35.0 0.0.0.255
network 150.3.3.3 0.0.0.0
no auto-summary
!
router ospf 1
router-id 150.3.3.3
log-adjacency-changes
redistribute eigrp 10 metric 30 subnets
passive-interface Ethernet0/0
network 132.1.0.0 0.0.0.255 area 0
network 132.1.3.0 0.0.0.255 area 3
network 150.3.3.3 0.0.0.0 area 0
Router 4
router eigrp 10
redistribute ospf 1
network 132.1.45.0 0.0.0.255
no auto-summary
eigrp router-id 150.4.4.4
no eigrp log-neighbor-changes
!
router ospf 1
router-id 150.4.4.4
log-adjacency-changes
redistribute eigrp 10 metric 40 subnets
network 132.1.0.0 0.0.0.255 area 0
network 150.4.4.4 0.0.0.0 area 0
When I do not do the redistribution on router 4 then the network 132.1.35.0 is placed in all the other routers but 132.1.45.0 is not (it is in standby state)
When i break the R3-R5 frame realy connection the 132.1.45.0 is palced and the 132.1.35.0 vanishes.
When I connect the R3-R5 connection both the routres vanish from all the routers except for the connected ones.
Please help me understand the phenomenon.
10-18-2006 11:54 AM
This URL should help you:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008047915d.shtml
10-20-2006 02:19 AM
Hi, 2 issues here. first you have 2 redistribution points so you may need to stop networks from being fed back into their originating IGP. Secondly on the routers running 2 IGP's you may need to alter admin distance for the redistributed routes to ensure traffic is routed correctly (eg when external eigrp routes are distributed into OSPF, the OSFP AD will be prefered over the AD of 170 for EIGRP externals).
for the first issue I normally use route-maps like below and uses them when doing redistribution.
route-map ospf-eigrp deny 10
match tag 90
route-map ospf-eigrp permit 20
set tag 110
route-map eigrp-ospf deny 10
match tag 110
route-map eigrp-ospf permit 20
set tag 90
10-20-2006 01:51 PM
thanx .I have understood the loop issue.
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