[c-nsp] SVI or not SVI

[Brendan Mannella]

Hey John,

I decided to use a /30 instead of having a switched port.

Regarding the Sup32 memory, I have tuned the CAM a bit so now its look
this..

FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4                - 239k 
 MPLS                - 1k (default)
 IPv6 + IP Multicast - 8k (default)

So yes it will be a little close, but will hold a full table for now.
Supposedly, Cisco is coming out with a 3BXL for the Sup32 that can be field
upgraded which will solve this issue.

Thanks,

Brendan

-----Original Message-----
From: john heasley [mailto:heas at shrubbery.net] 
Sent: Sunday, December 03, 2006 12:07 AM
To: Brendan Mannella
Subject: Re: [c-nsp] SVI or not SVI

Sat, Dec 02, 2006 at 10:02:54PM -0500, Brendan Mannella:
> Hello,
> 
>  
> 
> I am in the process of configuring my new Cisco Cat 6504 with Sup32.
> Interface 2/48 is going to be connected to my interface on my Juniper
border
> router. Something like this?
> 
>  
> 
> Juniper M10 ---> Cat 6504 
> 
>  
> 
> My question is, what is the proper way to do this connection? Should int
> 2/48 be a switchport and then create a SVI with the ip address. Or should
it
> NOT be a switchport and I configure the ip directly on the interface. But
if
> I place the ip directly on the interface, then I am unable to use the
> ?switchport mode access? and ?switchport access vlan XX? on the interface.
> 

Hi Brendan,
Like the other person mentioned, if you want that several ports to lie on
that LAN, then an SVI is used.  More likely, you want a /30 on a routed
interface, where everything else remains behind your switch, where
ultimately
you want confined broadacst domains for your customers (ie: they have a
single routed port or a routed private vlan [of multiple ports])

I suspect, though I've not looked into the limitations of the sup32, that
you
might want that port to be a trunk so that you could deliver vlans from the
Juniper to your BGP customers.  IIRC, the sup32 has some memory limitations
that may make carrying a full BGP table tight; specifically cam memory for
forwarding.

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