Re: asymmetric routing

So I have have a few thoughts on this...

First, is it causing a problem (bandwidth congestion, added latency,
etc...) requiring fixing? Asymmetric routing can exist without harming
traffic (i.e. the Internet)

Second, I thought about a fix. Since issue originates upstream I think
you will need to work with SP to possibly tag or send community valus
on upstream devices that can help identify where traffic is
originating and using these characteristics to filter.

HTH

Marc Edwards
CCIE #38259

On Fri, Mar 1, 2013 at 6:56 PM, Tony Singh <mothafungla_at_gmail.com> wrote:
> Hi Marc
>
> Its is one AS bro, im stumped a bit here...
>
> Say that same source gets to a subnet behind CE1 and everything works fine
> on this inbound-to-outbound path then the same source decides to reach a
> subnet behind CE2 where inbound everything is ok but outbound for the CE2
> originating subnet it prefers CE1 due to best path selection 11 lowest
> router-id..
>
> Now if I knew the source prefix I would create a standard ACL and route map
> to achieve the desired goal, I'm sure I can figure this out with some help
> :0)
>
>
> Tony
>
>
> On 2 March 2013 02:40, marc abel <marcabel_at_gmail.com> wrote:
>
>>
>> Is it one provider or 2? Can you do As path prepending?
>>
>>
>> On Fri, Mar 1, 2013 at 8:23 PM, Tony Singh <mothafungla_at_gmail.com> wrote:
>>
>>> Hi Experts
>>>
>>> Just like to gauge what would you do on best practice if we have the
>>> following scenario
>>>
>>> PE1>CE1>FW>SW>trunk>SW>FW>CE2>PE2
>>>
>>> SW's are RR
>>>
>>> traffic inbound to particular subnets is influenced by outbound policies
>>> on
>>> the MED attribute, but my problem is when routing outbound the lowest
>>> router-id of CE1 wins when the packet originated from CE2
>>>
>>> Now "when you do not know" what the out-to-in source prefixes will be,
>>> then
>>> what is the best design practice you would follow?
>>>
>>> BR
>>>
>>> Tony
>>>
>>>
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>>
>>
>> --
>> Marc Abel
>> CCIE #35470
>> (Routing and Switching)
>
>
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Received on Fri Mar 01 2013 - 19:24:19 ART