[j-nsp] Redistribute Connected

[Frans Legdeur]

Hi Brendan,

Looking through the other posts and your remarks, this looks like a problem
that your other i-BGP router doesn't accept the routes, does it?

First you have to ensure that inside your AS all networks are reachable
through an IGP like OSPF or ISIS. Not all of your attached networks have to
be part of your AS, so you might need some policies to import external
networks. Inside your AS, the IGP should do the job, outside the AS, BGP is
your friend. Also ensure that unknown segments are advertised internally, so
including the /30 between you and your transit neighbor, else your other
router doesn't know where he can find his next hop for the i-BGP routes.
(There are other ways to solve this, like next-hop self or add the interface
passive to OSPF/ISIS, but this is the best way to my opinion ;-)

All routes within your /21 should be arranged by your IGP, including the
alien /30's for interconnecting with your external BGP neighbors.

Kind regards,

Frans.

> From: Brendan Mannella <bmannella at teraswitch.com>
> Date: Mon, 24 Nov 2008 20:45:33 -0500 (EST)
> To: le van cuong <cuonglv at gmail.com>
> Cc: <juniper-nsp at puck.nether.net>
> Subject: Re: [j-nsp] Redistribute Connected
> 
> I already advertise my entire /21 to eBGP transits. I am just trying to make
> the two router aware of which has a specific subnet.
> 
> Brendan Mannella 
> President and CEO
> TeraSwitch Networks Inc.
> Ph: 412-387-3543 
> Mobile: 412-592-7848
> Efax: 412-202-7094
> 
> ----- Original Message -----
> From: "le van cuong" <cuonglv at gmail.com>
> To: "Brendan Mannella" <bmannella at teraswitch.com>
> Cc: juniper-nsp at puck.nether.net
> Sent: Monday, November 24, 2008 8:57:08 PM GMT -05:00 US/Canada Eastern
> Subject: Re: [j-nsp] Redistribute Connected
> 
> 
> Hi Brendan, 
> 
> I think you need to create a policy with mach term direct and then export to
> IBGP and also EBGP if needed. BGP itself will not be redistributed other
> protocol to its neighbor.
> 
> ex: 
> policy-options { 
> policy-statement dr-bgp {
> term 1 { 
> from { 
> protocol direct; 
> route-filter x.x.x./y exact;
> } 
> then accept; 
> } 
> } 
> } 
> 
> Regards& Good Luck,
> 
> Cuong, 
> 
> 
> On Tue, Nov 25, 2008 at 8:25 AM, Brendan Mannella < bmannella at teraswitch.com >
> wrote: 
> 
> 
> Hello, 
> 
> I am working with two M7is running EBGP with a transit on each, and IBGP
> between the two routers. When i create a new sub interface with a ip and vlan
> on one router the route is not being advertised to the other router via IBGP.
> I assume i need some policy for that. Can anyone shed any light on how to do
> this? 
> 
> Thanks, 
> 
> Brendan 
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