[c-nsp] Policy Based Routing Question

[virendra rode //]

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Paul Stewart wrote:
> Thanks Roland...
> 
> Site C is the ultimate destination of all traffic (our core network).  There
> is no BGP involved, only OSPF.  The solution is totally within our IP space
> and managed by ourselves.
> 
> The T1's will be loadbalanced via CEF/OSPF.  The same load balancing applies
> on the dual ADSL link as well (forgot to mention that earlier).  Load
> balanced on both sides of both links.
> 
> The reason for wanting this traffic manipulated is that we are providing
> voice and data services.  The voice services should take a primary route via
> the T1's and the data services should take a primary route via the ADSL
> connections.   The thought was to have one router onsite combining all the
> traffic so that if there was an outage, we could dynamically re-route
> traffic versus having the voice and data totally separate.  To clarify the
> voice portion, it is VOIP on the T1's, not PRI ;)
> 
> Since all the voice traffic originates and terminates from one particular IP
> on our core network I was hoping to do this via IP address or subnet.
- -------------------------------
I guess you could create route-map statement(s) for specific ip range
(ACL) and use next-hop route.

As far as OSPF goes couldn't you filter traffic by setting cost of your
link on each router? In an event of an outage, this will help you move
traffic to good link.

Would a setup like this help?


regards,
/virendra

> 
> Thanks in advance,
> 
> Paul
>  
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Roland Dobbins
> Sent: Tuesday, April 03, 2007 3:55 PM
> To: Cisco-NSP Mailing List
> Subject: Re: [c-nsp] Policy Based Routing Question
> 
> 
> On Apr 3, 2007, at 12:22 PM, Paul Stewart wrote:
> 
>> Can I do this with policy based routing? ;)
> 
> Is the ultimate destination of -all- the traffic originating from Site B (or
> northbound of there) Site A, from your perspective?  Is there any BGP
> involved, or is Site A participating in your IGP, or  
> just taking default from you?  What about Site C, same questions?   
> Also, how are the T1s loadbalanced, and are they loadbalanced on both the PE
> and CPE sides?
> 
> When you say you want the inbound/outbound traffic to be symmetrical in
> nature, is this because you require that symmetry because of a stateful
> firewall or some other kind of policy-enforcement device which needs to see
> both sides of each conversation?
> 
> -----------------------------------------------------------------------
> Roland Dobbins <rdobbins at cisco.com> // 408.527.6376 voice
> 
>          Words that come from a machine have no soul.
> 
>                        -- Duong Van Ngo
> 
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