Re: redistribution help

Well done! Looks stable with full igp reachbility. Very valuable for me to
reference. Can't thank you enough. Faith has been restored :-D

Marc

On Sat, Feb 25, 2012 at 1:15 PM, Jochen Bartl <jochen.bartl_at_gmail.com>wrote:

> Hi Marc,
>
> I haven't reviewed your configs yet, but started to work on a solution
> on my own. The RIB seems to be stable according to "debug ip routing"
> and I have full reachability.
>
> Instead of using tagging, I just tried to protect the lower AD routes in
> the RIB on border routers that are doing the redistribution.
>
> Here is a short summary of what I did:
>
> R1
> ==
>
> - OSPF distribute list: Filter EIGRP external (AD 170) and RIP (AD 120)
> prefixes from entering RIB with AD of 110
> - RIP distance 190: Protect external EIGRP routes when learned via RIP
> from R2
> - RIP distance 120 from R4: Original RIP prefixes should keep AD of 120
>
> R2
> ==
>
> - OSPF distribute list: Filter RIP (AD 120) prefixes from entering RIB
> with AD of 110 when learned from another OSPF router
>
> R3
> ==
>
> - OSPF distribute list: Filter EIGRP external (AD 170) from entering RIB
> with AD of 110 when learned from another OSPF router
>
>
>
> Filter config
> -------------
>
> R1
>
> ip prefix-list PL_EIGRP_EXT permit 172.20.106.0/24
> ip prefix-list PL_EIGRP_EXT permit 6.6.6.0/24
> !
> ip prefix-list PL_RIP permit 172.20.104.0/24
> ip prefix-list PL_RIP permit 4.4.4.0/24
> !
> route-map OSPF_RIB_FILTER deny 10
> match ip addr prefix PL_EIGRP_EXT
> route-map OSPF_RIB_FILTER deny 20
> match ip addr prefix PL_RIP
> route-map OSPF_RIB_FILTER permit 1000
> !
> router ospf 1
> distribute-list route-map OSPF_RIB_FILTER in
> !
> ip access-list standard RIP_PREFIXES
> permit 172.20.104.0 0.0.0.255
> permit 4.4.4.0 0.0.0.255
> !
> router rip
> distance 190
> distance 120 172.20.124.4 0.0.0.0 RIP_PREFIXES
>
>
> R2
>
>
> ip prefix-list PL_RIP permit 172.20.104.0/24
> ip prefix-list PL_RIP permit 4.4.4.0/24
> !
> route-map OSPF_RIB_FILTER deny 10
> match ip addr prefix PL_RIP
> route-map OSPF_RIB_FILTER permit 1000
> !
> router ospf 1
> distribute-list route-map OSPF_RIB_FILTER in
>
>
> R3
>
> ip prefix-list PL_EIGRP_EXT permit 172.20.106.0/24
> ip prefix-list PL_EIGRP_EXT permit 6.6.6.0/24
> !
> route-map OSPF_RIB_FILTER deny 10
> match ip addr prefix PL_EIGRP_EXT
> route-map OSPF_RIB_FILTER permit 1000
> !
> router ospf 1
> distribute-list route-map OSPF_RIB_FILTER in
>
>
> Best regards,
>
> Jochen

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Received on Sat Feb 25 2012 - 15:45:23 ART