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Adv new subnet to ISP and Inbound soft reconfiguration

mahesh18
Frequent Contributor
Frequent Contributor

Hi Everyone,

 

We have BGP nei with one of ISP and we are not advertising our network to them.

show ip bgp neighbors 206.x.x.253 received-routes
% Inbound soft reconfiguration not enabled on 206.x.x253

 

I checked route refresh is configured by default.

 

If i advertise our network to them and run the above command again then I should see received routes from the ISP right?

 

Regards

Mahesh

10 Replies 10

Georg Pauwen
VIP Master VIP Master
VIP Master

Hello,

 

not sure what you are asking. Seeing the routes with the command you mentioned is not related to sending your own network(s) to the ISP. You need soft reconfiguration configured in order to use that command.

 

sh ip bgp neighbors x.x.x.x routes

 

does work with the soft reconfiguration inbound configured.

mahesh18
Frequent Contributor
Frequent Contributor

What I wanna achieve is advertise our network to ISP and then learn the routes from the ISP.

To make this work do i need to config soft reconfig for that ISP network?

nazimkha
Enthusiast
Enthusiast
You need to run this command on your router to check advertised routes

show ip bgp neighbors 206.x.x.253 advertised-routes

paul driver
VIP Expert VIP Expert
VIP Expert

Hello

Enabling soft reconfiguration can have a detrimental effect your rrtr cpu/memory processing if it’s advertising/receiving lots of prefixes .

Nowadays you should not have to enable any soft reconfiguration as bgp supports route refresh which is a lot more efficient to update the adj ribs via a soft reset of each neighbor -

As such this RR capability does not need to store any additional bgp table to accommodate each of its bgp neighbours unprocessed prefixes .

 

if you do -

sh ip bgp neighbor | in Cap

 

This will tell you if your router and it’s bgp neighbor supports RR

 

Lastly to view advertised and receivied prefixes:

 

sh ip bgp neighbours xxxx routes

sh is bgp neighbours xxxxx advertised routes

 

To do a no disruptive RR soft reset of a neighbor  use-

 

clear ip bgp neighbor xxx soft in/out

 Or

clear ip  bgp * soft  - for all peers in/out 


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

I agree with those above.  If you want to see who you are peering with run sh ip bgp sum.  This will tell you how many prefixes your are receiving from a given peer.  Run sh ip bgp nei x.x.x.x adv to see which routes you are advertising and sh ip bgp nei x.x.x.x route to see which routes you are receiving.

mahesh18
Frequent Contributor
Frequent Contributor

thanks for very usefull info

 

to check if RR is configured on nei router i run this command

 

show ip bgp neighbor 206.x.x.253 | inc Cap
Four-octets ASN Capability: advertised and received
Graceful Restart Capability: received
Enhanced Refresh Capability: advertised
Multisession Capability:

 

how can i tell from this if local and nei router are configured with RR?

 

Best Regards

Mahesh

mahesh18
Frequent Contributor
Frequent Contributor

thanks for very usefull info

 

to check if RR is configured on nei router i run this command

 

show ip bgp neighbor 206.x.x.253 | inc Cap
Four-octets ASN Capability: advertised and received
Graceful Restart Capability: received
Enhanced Refresh Capability: advertised
Multisession Capability:

 

how can i tell from this if local and nei router are configured with RR?

 

Best Regards

Mahesh

Hello

it looks like this neighbor is capable of outbound rr updates 

Just to confirm post the following:

 

show ip bgp neighbor 206.x.x.253 | be  Neighbor cap

or

show ip bgp neighbor 206.x.x.253 | be  Route


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

mahesh18
Frequent Contributor
Frequent Contributor

I run that command it shows no output.

mahesh18
Frequent Contributor
Frequent Contributor
thanks for very usefull info



to check if RR is configured on nei router i run this command



show ip bgp neighbor 206.x.x.253 | inc Cap
Four-octets ASN Capability: advertised and received
Graceful Restart Capability: received
Enhanced Refresh Capability: advertised
Multisession Capability:



how can i tell from this if local and nei router are configured with RR?



Best Regards

Mahesh
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