From: Lekan Magbagbeola (lekkyl@xxxxxxxxxxx)
Date: Fri Jul 26 2002 - 19:02:01 GMT-3
Aurelio,
In order to route between VLANs on CAT3550, all you need to do is to
configure a corresponding SVI for the VLANs and IP traffic is internally
routed between the VLANs on the same switch. If the hosts are connected on
two or more CAT3550s, configure a trunk port between the two switches, this
will be able to carry traffic across for all configured VLANs.
You could also configure an SVI to provide IP connectivity to the switch. In
case of CAT2950, you can only configure one SVI interface.
By default CAT3550 ports are L2 switchports and in order to make a
particular port a routed port, you use "no siwtchport" interface command. A
routed port on CAT3550 is not associated with a particular VLAN and does not
support VLAN subinterfaces, but behaves like a normal routed interface.
After assigning IP address to the SVIs and routed ports, you could run a
particular routing protocol on the interfaces the way you would do on any
other Cisco router.
In CAT3550, BVI is not really supported, the alternative to doing irb is to
configure "fallback bridging". With this feature, you'll be able to bridge
unroutable traffic between routed interfaces (SVI and routed ports).
If you want to bridge traffic from different VLANs and routed ports, all you
need do is to put them all in one single bridge group. While doing this
remember that, spanning tree protocol ibm and dec are not suported, you need
to use "vlan-bridge" spanning tree protocol. Please check CCO for the CLIs
necessary to do this.
Per "mls" keyword, as far as I know that is used in QoS configuration on
CAT3550 which is entirely different from the topic of discussion.
I hope this helps.
Lekan
>But how do you configure multilayer switching/routing? Is it like an
>RSM/MSFC ?
>i.e.
>interface vlan 20
> ip address x.x.x.x
>
>or like a cat2948G-L3 where you have to subinterface the port to trunk it
>and create BVI's to route
>i.e.
>interface fastethernet 0/1.1
> bridge-group 1
>
>interface BVI1
> ip add x.x.x.x
>
>The only thing that the documentation says is that you are supposed to type
>'no switchport' and then assign an ip address
>i.e.
>interface fastethernet 0/1
> no switchport
> ip address x.x.x.x
>
>So is it a multiport router? How do you route the vlans? How about
>trunks?
>And if it is truly a multilayer switch, wouldn't we have to enter mls
>commands somewhere?
>
>Any help is appreciated.
>
>Thanks
>Aurelio
>
>
>
>-----Original Message-----
>From: Lekan Magbagbeola [mailto:lekkyl@hotmail.com]
>Sent: Friday, July 26, 2002 1:42 PM
>To: tedmcdermott@yahoo.com; ccielab@groupstudy.com
>Subject: Re: VLAN Capabilities of the new 2950 and 3550 Multilayer
>Switches
>
>
>Hi Ted,
>
>With Layer 3 image running on a CAT3550, it is as good as having a router
>in
>
>your network. You can run the following rotuing protocols: OSPF, RIP, IGRP
>and EIGRP. IS-IS is currently not supported. You could even configure some
>of the ports as a routed port.
>
>CAT2950 is a purely layer 2 switch and you cannot run any routing protocol
>on it.
>
>I hope this answers your question.
>
>Lekan
>
>
> >From: Ted McDermott <tedmcdermott@yahoo.com>
> >Reply-To: Ted McDermott <tedmcdermott@yahoo.com>
> >To: ccielab@groupstudy.com
> >Subject: VLAN Capabilities of the new 2950 and 3550 Multilayer Switches
> >Date: Fri, 26 Jul 2002 10:50:16 -0700 (PDT)
> >
> >Is it true that these new switches can perform IP
> >routing between their Ethernet ports?
> >
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:36:45 GMT-3