[c-nsp] L3 Interface for 2821

[Paul Stewart]

You only need to create the SVI's if you need layer3 in place... if you just
want to trunk VLAN's between the two there's no need to use them....

I would image you can do a LOT of VLAN's on them (don't know for sure but
guessing at 250).... never done many as never had reason.  But the nice
thing as someone else confirmed is that you can do dot1q trunking on the
ports.... 

Take care,

Paul


-----Original Message-----
From: Bernd Ueberbacher [mailto:noc at mynet.at] 
Sent: Wednesday, July 04, 2007 8:47 AM
To: Paul Stewart
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] L3 Interface for 2821

Thanks for the fast reply!

What would I do if I need about 10 VLANs on my 4 port interface?

The router doesn't shout at me if I configure one of the ports of the 4ESW
as a trunk. Should I do that and then create interface Vlan1, Vlan2, ...? Is
this a "good" solution, considering performance etc? Is there a limit for
the number of VLANs (HWIC-4ESW)?

Thanks,
Bernd






Paul Stewart wrote:
> interface FastEthernet4
> switchport mode access
> switchport access vlan 10
>
> interface Vlan10
> ip address 10.1.1.1 255.255.255.0
>
> Create the VLAN in your VLAN database and that should do the trick 
> just fine....  You need to use a SVI to make it layer3
>
> I don't believe you can do trunking on the 4ESW but never had a reason 
> to try neither....  you could try doing a "switchport mode trunk", 
> "switch trunk allowed vlan 10,20" and create an SVI for each VLAN and 
> see if that works....
>
> Paul
>  
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Bernd 
> Ueberbacher
> Sent: Wednesday, July 04, 2007 8:27 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] L3 Interface for 2821
>
> Hi there!
>
> Once again I have a small problem and I'm sure you guys can help me 
> out ;-) I have two 2821 routers. They have 2 Gi interfaces onboard.
> In one of them I have a HWIC-4ESW.
>
> I'd like to connect a Catalyst 2950 to a third interface of the router. 
> I need to configure the switchports (on the Catalyst) as access ports 
> with different VLANs. On a L3 interface I could then create for 
> example a
> FastEthernet0/1.321 for the VLANs. On the HWIC-4ESW this isn't 
> possible, as it is only a L2 interface :-( I read that it should be 
> possible to configure a L2 interface to a L3 interface since 12.3(4)T 
> (no switchport). This doesn't work for me (or for this module?).
>
> So what would be the best way to hook up the Catalyst to the router 
> (for this purpose)? Is there a (cheap) L3 FE module for the 2800 
> series available?
>
>
> Thanks,
> Bernd
>
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net 
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>
>