[c-nsp] IOS XR BGP

[Vitkovsky, Adam]

I see so you are introducing the more specifics from igp into bgp with the network commands on the same router where you'd like to aggregate right?
Do you see the more specifics within the aggregate range in the particular BGP AF table?

adam

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick Ryce
Sent: Thursday, November 24, 2011 2:56 PM
To: Nick Ryce; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] IOS XR BGP

Still can't get this to work.

I have the network statement and a corresponding aggregate address statement with as-set appended.

Any other thoughts?

Nick

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick Ryce
Sent: 24 November 2011 12:54
To: Vitkovsky, Adam; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] IOS XR BGP

Hi Adam,

That's great thanks.

I had just focused on the summary only part which only summarise less specific BGP routes.

Nick

-----Original Message-----
From: Vitkovsky, Adam [mailto:avitkovsky at emea.att.com]
Sent: 24 November 2011 12:20
To: Nick Ryce; cisco-nsp at puck.nether.net
Subject: RE: IOS XR BGP

Same as in Jonos use the "aggregate" cmd:

2.    router bgp as-number
3.    address-family  { ipv4  | ipv6 } unicast
4.    aggregate-address address/mask-length  [ as-set ] [ as-confed-set ] [ summary-only ] [ route-policy route-policy-name ]

The as-set  keyword generates autonomous system set path information and community information from contributing paths.

The as-confed-set keyword generates autonomous system confederation set path information from contributing paths.

The summary-only  keyword filters all more specific routes from updates.

The route-policy route-policy-name  keyword and argument specify the route policy used to set the attributes of the aggregate route.


adam

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Nick Ryce
Sent: Thursday, November 24, 2011 11:49 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] IOS XR BGP

Hi,

I am moving from Juniper to Cisco ( IOS XR ) and am looking to emulate a certain feature ( aggregate addressing for BGP )

In Junos I can set routing-options aggregate route x.x.x.x/19 . If there is a less specific contributing route from IGP then the aggregate is announced through BGP.

In BGP on IOS XR you use the network statement network x.x.x.x/19 now you need to have an exact route for this ( normally setting a static route ).  This will not suit my requirements as if we lose IGP on that router I would like to stop announcing the ranges via BGP but the static route will still be there and I will theoretically blackhole traffic.

Any ideas how to allow BGP to announce an aggregate route when there is less specific in IGP would be a great help.


Thanks

Nick



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