[c-nsp] L3 Switch as a BGP Gateway

[Chris Evans]

And a cat 6k/7600 will take forever to reconverge with large tables.
On Jun 27, 2011 10:10 PM, "Jeff Kell" <jeff-kell at utc.edu> wrote:
> On 6/27/2011 2:59 PM, Jason Greenberg wrote:
>> Can someone advise me as to why a 3750 L3 Switch (Metro Model) wouldn't
outperform a 7300 series router as a multi-homed BGP gateway?
>
> They can't scale to a full BGP feed. If you do some exaggerated
> filtering and aggregation, maybe; if you just want defaults plus a few
> key routes, sure.
>
> I'm not sure about the Metro version of the 3750, but a few other data
> points...
>
> WS-3750G:
>
>> #sho sdm prefer routing
>> number of unicast mac addresses: 3K
>> number of IPv4 IGMP groups + multicast routes: 1K
>> number of IPv4 unicast routes: 11K
>> number of directly-connected IPv4 hosts: 3K
>> number of indirect IPv4 routes: 8K
>> number of IPv4 policy based routing aces: 0.5K
>> number of IPv4/MAC qos aces: 0.5K
>> number of IPv4/MAC security aces: 1K
>
> WS-3750E and WS-3750X are the same exact values. For that matter so are
> the 3560G and 3560X.
>
> But oddly enough, I have a 3750G-12 stack that shows a bit more:
>
>> #show sdm prefer routing
>> number of unicast mac addresses: 6K
>> number of IPv4 IGMP groups + multicast routes: 1K
>> number of IPv4 unicast routes: 20K
>> number of directly-connected IPv4 hosts: 6K
>> number of indirect IPv4 routes: 14K
>> number of IPv4 policy based routing aces: 0.5K
>> number of IPv4/MAC qos aces: 0.5K
>> number of IPv4/MAC security aces: 1K
>
> And an old 3550-12 (if you don't need the extended match template [IPv6
> or VRFs or policy routing]):
>
>> PCP-Phase-III-3550#sho sdm prefer routing
>>
>> number of unicast mac addresses: 6K
>> number of igmp groups: 6K
>> number of qos aces: 1K
>> number of security aces: 1K
>> number of unicast routes: 24K
>> number of multicast routes: 6K
>
> But bottom line, 24K is a whole lot less than the current routing tables
> (~360K last I checked).
>
> If you have a truckload of cash, and get the precisely correct
> supervisors / blades / daughtercards, the 6500/7600 can do multihoming
> with full feeds, but I think that's the only Catalyst platform that can.
>
> Jeff
> Jeff
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