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Route Redistribution

Unanswered Question
Sep 19th, 2014
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We are curently redistributiong routes between eigrp to bgp and bgp to eigrp in our routers, 1st router being primary and the 2nd router as backup with below configuration :

Primary Router

 ====

 Router eigrp x

 network 0.0.0.0

 network 0.0.0.0

passive-interface Loopback0

 redistribute bgp XXXX route-map bgp to eigrp

 redistribute static metric xx xx xx xx 

router bgp xxxxx

 network 0.0.0.0 mask 0.0.0.0

 network 0.0.0.0 mask 0.0.0.0

bgp log-neighbor-changes

 redistribute static

 redistribute eigrp xx route-map eigrp to bgp

neighbor 0.0.0.0  update-source Loopback0

 neighbor 0.0.0.0 remote-as xx

 neighbor 0.0.0.0  default-originate

 neighbor 0.0.0.0  soft-reconfiguration inbound

 neighbor 0.0.0.0  update-source Loopback0

 neighbor 0.0.0.0  distribute-list 10 in

neighbor 0.0.0.0  remote-as xxxxxx

 neighbor 0.0.0.0  route-map local pref in

 

Backup Router

=====

 router eigrp xx

network 0.0.0.0

network 0.0.0.0

redistribute static metric xx xxx xx xx xxx

 redistribute bgp xxxxx route-map bgp to eigrp

 

 router bgp xxxxx

 no synchronization

 bgp log-neighbor-changes

 neighbor 0.0.0.0 update-source Loopback0

 network 0.0.0.0 mask 0.0.0.0

 redistribute eigrp x route-map eigrp to bgp

 neighbor 0.0.0.0 remote-as xx

 neighbor 0.0.0.0 soft-reconfiguration inbound

 neighbor 0.0.0.0 route-map as-prepend out

 neighbor 0.0.0.0 remote-as xxxxx

 

My question is about performing redistribiution from eigrp into bgp and from bgp into eigrp on both routers and if this may create loss of info. down the road as well as a possible asymetric routing issue within our other locations , so i wonder if my point is valid.

 

Another question i have is about neighbor....... soft-reconfiguration inbound and since i have recently read about bgp v.4 that supports a feature called route refresh which provides the same function so i wonder if we can remove neighbor ..... soft-reconfiguration inbound from bgp configuration and if it would generate a negative or positive impact on bgp configuration.

Could anyone provide some feedback please?

 

 

 

 

 

 

 

 

 

 

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Overall Rating: 4 (2 ratings)
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Akash Agrawal Sat, 09/20/2014 - 00:43
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  • Cisco Employee,

Hi,

 

Will try to answer your queries

 

1. Any possibility of routing loop :

   I am not sure about topology but while redistributing from eigrp to bgp, set some community and on other router while redistributing bgp to eigrp, dont redistribute prefixes with that community marked on R1.

Similarly while redistributing bgp to eigrp, set tag an use same tag not to redistribute back to bgp.

 

 

2.  Route Refresh vs Soft Reconfiguration

 

Please go through below link, having excellent explanation of both feature.

http://ccieblog.co.uk/bgp/route-refresh-capability-vs-soft-reconfiguration

 

 

--pls dont forget to rate helpful posts--

Regards,

Akash

eandrcisco007 Mon, 09/22/2014 - 07:18
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Hi Akash,

 

Thank you vey much, you have answered my question about Route Refresh vs Soft Reconfiguration,

 

Would you please provide a bit more details about your comments about # 1, possibility of a loop please?

 

Akash Agrawal Mon, 09/22/2014 - 09:44
User Badges:
  • Cisco Employee,

Hi,

 

Can you please elaborate your question on below lines

"My question is about performing redistribiution from eigrp into bgp and from bgp into eigrp on both routers and if this may create loss of info. down the road as well as a possible asymetric routing issue within our other locations , so i wonder if my point is valid."

 

I mentioned possibility of loop in scenario when on R1 you redistribute bgp routes to eigrp and on R2 redistribute same external eigrp routes back to bgp and advertising it back to same AS which advertised prefixes on R1. This may create routing loop. Please correct me if i am wrong.

 

eandrcisco007 Mon, 09/22/2014 - 12:09
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Hi Akash,Now i got your point, at firest I was confused about your statemenet but i got it, you are correct, thank you.

I am going to look into it,

About Route Refresh vs Soft Reconfiguration and according to provided link and explanation, i assume route refresh  advertises its information as it expected but would that be enough to remove neighbor....... soft-reconfiguration inbound from the router bgp configuration without having any ipmact?

 

 

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