How to find the routes my router is advertising

Answered Question
Sep 19th, 2007

Hi,

I have static route to my ISP. I would like to know, what route my router is advertising to its upstream router

I am having Cisco 2815 ISR

Thanks,

Chandru

I have this problem too.
0 votes
Correct Answer by Richard Burts about 6 years 7 months ago

Chandru

In your original post you state that you have static route(s) to the ISP. In that case it is very likely that the ISP also has static routes to you. So your router is not sending or advertising any routing information to the ISP.

HTH

Rick

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sundar.palaniappan Wed, 09/19/2007 - 11:28

Chandru,

If you are running BGP issue the following command to check the routes being advertised out.

show ip bgp nei advertised-routes

Instead if you run an IGP (EIGRP/OSPF), which I highly doubt you do, then if you have a neighbor then all the routes in the routing table would be advertised unless you have a distribute list that's only allowing certain networks in the routing table to be advertised.

HTH

Sundar

csaravanan Wed, 09/19/2007 - 11:32

Sundar,

I am not running BGP or any other routing protocol in my router.

My router external interface is connected to the T1 link and internal interface is connected to the switch which goes to the firewall.

I am wondering what network will my router advertise to the ISP. Do you feel my router will not advertise any routes at all. or what info my router will be sending to the ISP router

Thanks,

Chandru

Correct Answer
Richard Burts Wed, 09/19/2007 - 12:42

Chandru

In your original post you state that you have static route(s) to the ISP. In that case it is very likely that the ISP also has static routes to you. So your router is not sending or advertising any routing information to the ISP.

HTH

Rick

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