BGP redistributed in EIGRP and Vice Versa

Answered Question
Apr 3rd, 2008
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Hello;


I'm having an issue with BGP routes not appearing on a Catalyst 3750 switch. There is a connection between Cat3750 and Cisco 2811. BGP routes are not being redistributed via EIGRP on my Cat3750. It appears that the EIGRP routes are getting to the Cisco 2811.


Please point help or point me to documentation that will help me figure out this solution.


Thanks in advance for your help.

Correct Answer by lamav about 9 years 1 month ago

Glad I could help.


Dont forget to jazz me up with my points. :-)


Victor

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lamav Thu, 04/03/2008 - 18:55
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Hi:


Why dont you post the configs so we can take a look at whats going on?

sean-boston Thu, 04/03/2008 - 19:02
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Okay... Here it is from the Cisco 2811...


router eigrp xxx

redistribute connected

redistribute bgp xxxxx

network 10.xxx.xxx.xxx

network 75.xxx.xxx.xxx

network 142.xxx.xxx.xxx

network 192.xxx.xxx.xxx

no auto-summary

!

router bgp xxxxx

bgp router-id 10.xxx.xxx.xxx

bgp log-neighbor-changes

timers bgp 15 45

neighbor 75.xxx.xxx.xxx remote-as 852

neighbor 75.xxx.xxx.xxx description Primary CML3 Link

neighbor 75.xxx.xxx.xxx password 7 password

neighbor 75.xxx.xxx.xxx version 4

neighbor 75.xxx.xxx.xxx remote-as 852

neighbor 75.xxx.xxx.xxx description Secondary CML3 Link

neighbor 75.xxx.xxx.xxx password 7

neighbor 75.xxx.xxx.xxx version 4

!

address-family ipv4

redistribute connected

neighbor 75.xxx.xxx.xxx activate

neighbor 75.xxx.xxx.xxx activate

no auto-summary

no synchronization

bgp redistribute-internal

bgp scan-time 5

exit-address-family

lamav Thu, 04/03/2008 - 19:31
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OK, how about the 3750 now?


I imagine the eigrp process on both routers are for the same AS number, right?


[EDIT] What Im getting at is that the 3750 and the 2811 should be running the same eigrp process and have established an eigrp adjacency between them.


Also, you removed the BGP AS number from the config, so Im wonder if this is an iBGP set up or eBGP? From the bgp redistribute-internal command, I would think that its an iBGP implementation. No?


Lastly, I imagine that the 2811 is an edge router and the 3750 is on the core and running only eigrp.

lamav Thu, 04/03/2008 - 19:56
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By the way, I just noticed that you have not set a default-metric under the eigrp process for the redistributed BGP routes. You have to do that for the router to know what kind of metric to assign the new iBGP-learned routes.

sean-boston Fri, 04/04/2008 - 05:58
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Yes the eigrp AS numbers are the same.


There is an eigrp adjacency between the 3750 and 2811.


What about the AS number that would tell me if it is iBGP or eBGP? It is a five digit number if that helps.


Last part your imagination is correct. The 2811 is a WAN router and the 3750 is a core device running eigrp only.

lamav Fri, 04/04/2008 - 06:33
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Sean:


What about the default metric that I mention in bold letters above?


Victor

sean-boston Fri, 04/04/2008 - 06:43
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I don't have a default-metric. That could be my problem.

lamav Fri, 04/04/2008 - 06:57
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LOL..I know you dont have one configured, Sean. That is my point! :-)


Configure it. You must have that in your configuration, otherwise the eigrp process running on your 2811 will not know what metric to assign the routes that will be redistributed into it from BGP.


So, configure it and lets see if thats your only problem.


Try entering this under the eigrp process on the 2811


default-metric 10000 100 255 1 1500


sean-boston Fri, 04/04/2008 - 07:49
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Looks like that did it. I'm just verifying my routes.


Thanks for your help.

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lamav Fri, 04/04/2008 - 08:22
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Glad I could help.


Dont forget to jazz me up with my points. :-)


Victor

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