[c-nsp] IOS XR BGP

[Nick Ryce]

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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