From: Chuck Church (cchurch@MAGNACOM.com)
Date: Sun Sep 22 2002 - 20:14:21 GMT-3
Nate,
The layer 2 switch cannot make any layer 3 forwarding decisions with
a dot1q trunk. So yes, they'll all have to pass through the interface. I
think you're thinking of MSM, where a layer 3 module on the switch can setup
a layer 3 flow, and then hand it off to the layer 2 portion of the switch.
At least that's my understanding of MSM. Could be wrong though about that
part.
Chuck Church
CCIE #8776, MCNE, MCSE
Sr. Network Engineer
Magnacom Technologies
140 N. Rt. 303
Valley Cottage, NY 10989
845-267-4000
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
CCIE Prep
Sent: Sunday, September 22, 2002 6:00 PM
To: ccielab@groupstudy.com
Subject: 802.1Q Trunk Question
For the purposes of this discussion, let's assume that we have a router
running dot1q encapsulation on an interface connected to a switch. The
switch port is programmed as a Dot1q trunk and connectivity is established
and functioning correctly. The router has subinterfaces programmed for
VLAN1 and VLAN2. If a node from VLAN1 needs to communicate with a node on
VLAN2, does all the traffic traverse the ethernet interface of the router?
Or is the router simply used for routing decisions and the traffic remain on
the backplane of the switch?
Thanks in advance.
__________
Nate Kleven
Senior Network Engineer, CCNP Voice Access, MCSE
Expanets
6020 So 190th ST
Kent, WA 98032
(206)219.6135
"Experienced at Networked Solutions"
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