[bdNOG] Automatic update of Next Hops in Routing Policies for Internet bound traffic in interior routers.

Fri Nov 22 00:41:41 BDT 2013

Dear Nibir Bhai

The issue is choosing upstream based on source address/prefix. Changing localpref will not help caz you can only use one upstream at a time; you can utilize all. 

For source based TE, PBR is the only choice. 

Thanks
Fakrul

Sent from my iPhone

> On Nov 21, 2013, at 11:06 PM, "Mir Amin Uddiin @Yahoo" <nibir78 at yahoo.com> wrote:
> 
> Dear Aniruddha Da,
> 
> Is it possible to do iBGP full mesh? If so, PBR can be avoided and changing local-preference of default-routes (received from BRs) at DRs, upload can be manged without impacting CPU.
> 
> Please correct me if I missed to understand the problem statement correctly.
> 
> ~ nibir
> 
> 
> 
> On Thursday, November 21, 2013 6:48 PM, Aniruddha Barua <aniruddha.barua at colbd.com> wrote:
> Hello everyone,
> 
> Please view this email in plain text with mono-spaced fonts because it has a text based diagram.
> Please take a look at it. Generally, Policy Routing is done in Distribution Routers (DR) to send
> Internet bound traffic from a specific prefix to appropriate Border Router (BR) so that upward and
> downward traffic uses the same upstream SP. When prefixes are moved from one BR to another BR due to
> business requirements, Network Admin needs to manually update Next Hop information in Policy Routing
> configurations in all DRs. If the number of prefixes and/or the number of DRs increases, this
> becomes cumbersome. Is there any way (vendor specific and/or vendor independent) to automate these
> updates?
> 
> 
> 192.168.0.0/26--------\      <OSPF>
> 192.198.1.64/26-------(DR1)------|
> 192.200.2.128/25------/          |
>                                   |  ---(BR1)->  <eBGP Adv. 192.168.0.0/24 to upstream A>
> 192.168.0.64/26-------\          |  /
> 192.198.1.0/26--------(DR2)-----[SW]----(BR2)->  <eBGP Adv. 192.200.2.0/24 to upstream B>
> 192.200.2.64/26-------/          |  \
>                                   |  ---(BR3)->  <eBGP Adv. 192.198.1.0/24 to upstream C>
> 192.168.0.128/25------\          |
> 192.198.1.128/25------(DR3)------|
> 192.200.2.0/26--------/
> 
> 
> (DR)=Distribution Router, (BR)=Border Router, [SW]=Switch.
> 
> 
> With thanks and best regards,
> 
> ANIRUDDHA BARUA
> Email: aniruddha.barua at colbd.com, cto at colbd.com
> 
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