If you need to have one vlan be a member on several interfaces use a SVI. The routed port behaves similarly as the Fe0/0 port on, say, a 1841.
Example: Let's say you have a 7600 somewhere and a bunch of access switches hanging off it on different ports (Gi 2/1, Gi 2/2, Gi 2/3, ...). On the access switches you have a bunch of users that are supposed to sit on the same segment. Create the SVI and enable it on the towards the access switches and you're done & the users are happy (a bit simplified). On that same 7600 you're connecting to a pair of GSRs and you're going to run OSPF between them. To skip all that stuff about spanning-tree and let your 7600 simulate a real router set the 10GE interfaces as "no switchport" and they're going to be - in this case - point-to-point to the GSRs. Obviously the latter could have been done with SVIs too, it's just that then you need to worry about all those layer 2 features, prune it from any trunks you have towards the access, etc. HTH :) Kaj > From: "Jowi Nkwe (JM)" <[email protected]> > Date: Wed, 26 Aug 2009 02:55:04 -0700 > To: <[email protected]> > Subject: [OSL | CCIE_RS] Routing on Switches > > Can some please clarify this for me.. > > When enabling routing on switches, when do you use vlan interface and > when do one use the switchport interface with the command "no > switchport". > > Basically the difference in using the vlan interface and no > switchport. Just your perspective.
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