[c-nsp] ebgp load balancing using maxiumu-paths TCAM impact onSup720-3BXL?

[Kevin Hodle]

This would be a good solution if both of his sessions terminated on
the same edge router, but in Peter's scenario he has 2 sessions, each
on a different edge router so multi-hop load-balacing wouldn't be
helpful for him. If he had both upstream provider links on the same
edge router, I think he would be better off just doing
LACP/link-aggregation (or ml-ppp for serial links)  with his upstream
and using that for load-sharing since both of his upstream links are
terminating on the same router on his provider's side..

Cheers,
Kevin

On Wed, May 20, 2009 at 11:07 PM, Brad Hedlund (brhedlun)
<brhedlun at cisco.com> wrote:
> Better to use 'ebgp multihop' and peer to provider router's loopback.  Then
> have equal cost static routes to provider's loopback via the two physical
> interface next hop IP addresses.
>
> Cheers,
>
> Brad Hedlund
> bhedlund at cisco.com
> http://www.internetworkexpert.org
>
>
> On May 20, 2009, at 9:47 PM, "Peter Kranz" <pkranz at unwiredltd.com> wrote:
>
>> Setup is as follows; 2 edge routers, each with a BGP session receiving
>> full
>> routes to the same provider router. The provider is load balancing inbound
>> traffic to our AS nicely, 50/50 between the edge routers.. I would also
>> like
>> to load balance the outbound traffic.. I've considered adding
>> 'maximum-paths
>> 2' to install the two equal paths, but an concerned about FIB TCAM
>> impacts.
>> Will adding this command cause each equal cost route to take one
>> additional
>> TCAM entry, i.e. full routing table x 2 > 524k TCAM limit = EPIC meltdown?
>>
>>
>>
>> Current FIB TCAM:
>>
>> L3 Forwarding Resources
>>
>>            FIB TCAM usage:                     Total        Used
>> %Used
>>
>>                 72 bits (IPv4, MPLS, EoM)     524288      285506
>> 54%
>>
>>                144 bits (IP mcast, IPv6)      262144           5
>> 1%
>>
>>
>>
>> Peter Kranz
>> <http://www.UnwiredLtd.com> www.UnwiredLtd.com
>> Desk: 510-868-1614 x100
>>
>> Mobile: 510-207-0000
>> <mailto:pkranz at unwiredltd.com> pkranz at unwiredltd.com
>>
>>
>>
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-- 
||  Kevin Hodle
||
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