[c-nsp] Redundant Networks and EIGRP redistribution

[Bruce Pinsky]

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Scott Ingram wrote:
> I'm having issues with routing loops and EIGRP redistribution.  Any
> Ideas or guidance?
> 
> 

Without some context it's hard to say.  My first impression when I see lots
of redist connected and redist static in both EIGRP and BGP is that the BGP
peering points end up being learned over the peering session which is
always bad news.

Some of the questions I would ask:

- - Why are you redist'ing into EIGRP rather than sourcing?
- - What is the need to redist BGP into EIGRP?
- - Why do you need "bgp redistribute-internal"?
- - How are you preventing loops when you redist EIGRP back into BGP?
- - Why are you redist'ing static routes in both protocols?
- - Why redist connecteds into EIGRP when you use next-hop-self?

> On Router and Switch
> 
> router eigrp 99
>  redistribute connected
>  redistribute static
>  redistribute bgp 65500 route-map BGP-EIGRP-Redist
>  network 10.X.X.X 0.0.3.255
>  network 172.X.X.X 0.0.0.0
>  network 192.X.X.X 0.0.3.255
>  default-metric 10000 100 255 100 1500
>  no auto-summary
>  no eigrp log-neighbor-changes
> !
>  router bgp 65500
>  no synchronization
>  bgp log-neighbor-changes
>  bgp redistribute-internal
>  network X.X.X.X mask 255.255.255.252
>  network X.X.X.X mask 255.255.255.252
>  redistribute static
>  redistribute eigrp 99
>  neighbor 192.X.X.25 remote-as XXX
>  neighbor 192.X.X.25 update-source Loopback0
>  neighbor 192.X.X.25 next-hop-self
>  neighbor X.X.X.X remote-as 209
>  neighbor X.X.X.X default-originate
>  neighbor X.X.X.X route-map AS209_out out
>  neighbor X.X.X.X filter-list 2 in
>  neighbor X.X.X.X filter-list 1 out 
>  no auto-summary
> 
> ip as-path access-list 1 permit ^$
> ip as-path access-list 2 permit ^XXXX_[0-9]*$
> !
> !
> ip prefix-list AS65000_Primary description BGP Primary Verizon
> ip prefix-list AS65000_Primary seq 5 permit X.X.X.X/22
> ip prefix-list AS65000_Primary seq 5 permit X.X.X.X /32
> ip prefix-list AS65000_Primary seq 5 permit X.X.X.X /22
> !
> !
> route-map AS65000_out permit 10
>  match ip address prefix-list AS65000_Primary
>  set local-preference 150
> 
> On 6506
> route-map AS209_out permit 10
> match ip address prefix-list AS209_Backup
> set as-path prepend 100 100 100    
> 
> 
> 
> 
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bep

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