From: mgrenham@eircom.net
Date: Fri May 13 2005 - 06:43:34 GMT-3
Yes I spent some time trying to solve this exact problem about 2 years ago but never got to the bottom of it. The Telci I was working for wanted to convert incoming VLAN's to a different number for transportation over 801.1q so that there would not be any conflicts.
One possible solution to this is to use the connected ports between both switches and connect VLAN 2 and 20 together (Access ports). This will make one big broadcast domain of the two local VLAN's.
Just a thought.
Ollie.
"Brian McGahan" <bmcgahan@internetworkexpert.com> wrote:
<
< Tim,
<
< Neither fallback bridging nor .1q tunneling are the solution ;)
<
<
< HTH,
<
< Brian McGahan, CCIE #8593
< bmcgahan@internetworkexpert.com
<
< Internetwork Expert, Inc.
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<
<
< > -----Original Message-----
< > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
< Of
< > ccie2be
< > Sent: Thursday, May 12, 2005 4:00 PM
< > To: 'Jongsoo kim'; Group Study; Brian McGahan; Brian Dennis
< > Subject: RE: dot.1q tunneling - IE Vol II, lab 9, task 1.4
< >
< > Hi Jongsoo,
< >
< > I tried your config but, alas, it didn't work.
< >
< > I also tried using that same config on both switches but that didn't
< work
< > either.
< >
< > What bothers me most is that even if this did work, I can't figure out
< how
< > it would.
< >
< > BTW, I didn't change anything on the rtr's on either side of the
< Cat's. I
< > left those interfaces with just the ip address configured.
< >
< > When you think about it, this I don't believe this should work.
< Here's my
< > thinking.
< >
< > Fallback bridging is for NON IP traffic ie non-routable traffic.
< >
< > But, for this scenario to work properly, I need to be able to ping
< from
< > rtr-1 to rtr-2.
< >
< > Now, the Cat port connected to rtr-1 is configured to be in vlan 2 and
< the
< > cat port connected to rtr-2 is in vlan 20.
< >
< > And, the cat's are trunked together via 802.1q
< >
< > With Fallback bridging configured, what happens to a packet from rtr-1
< > when
< > Cat-1 gets it?
< >
< > Since it's an ip packet, I think the cat will process it just like any
< > normal ethernet frame ie it will see if the dest mac addr is in the
< mac
< > table for vlan 2.
< >
< > Not finding it there, it will send it to all ports in vlan 2 including
< the
< > trunk port connecting the 2 Cat's. When the 2nd Cat gets it, I think
< Cat-
< > 2
< > will drop it as it won't find that dest mac addr in it's vlan 2 table
< even
< > though vlan 2 is bridged to vlan 20.
< >
< > What do you think?
< >
< > Tim
< >
< > _____
< >
< > From: Jongsoo kim [mailto:bstrt2002@gmail.com]
< > Sent: Thursday, May 12, 2005 3:53 PM
< > To: ccie2be
< > Subject: Re: dot.1q tunneling - IE Vol II, lab 9, task 1.4
< >
< > I am doing fine.
< >
< > Can you just do something like the below on one of switch without
< > configuring ip address?
< >
< > interface Vlan 2
< > bridge-group 1
< > interface Vlan 20
< > bridge-group 1
< > bridge 1 protocol vlan-bridge
< >
< >
< > Jongsoo
< >
< > On 5/12/05, ccie2be <ccie2be@nyc.rr.com> wrote:
< > Hey Jongsoo,
< >
< > It's good to hear from you. I hope you're doing well. As for me, I'm
< > working through the new IE practice labs as you can see.
< >
< > At the moment, I'm working on labs for which the Solutions haven't as
< yet
< > been posted.
< >
< > I considered using Fallback Bridging to fulfill this task but I can't
< see
< > how to use it as there are no L3 Cat ports involved in this config.
< >
< > Fallback Bridging requires that L3 ports be put into a bridge-group.
< In
< > this scenario, I could make the port connecting rtr-1 or rtr-2 a L3
< port
< > but
< > what about the trunk connecting the 2 Cat's?
< >
< > If you have any ideas, please show me what you would configure.
< >
< > Thanks, Tim
< >
< >
< >
< > _____
< >
< > From: Jongsoo kim [mailto: bstrt2002@gmail.com]
< > Sent: Thursday, May 12, 2005 1:22 PM
< > To: ccie2be
< > Subject: Re: dot.1q tunneling - IE Vol II, lab 9, task 1.4
< >
< > How are you doing. Tim?
< >
< > if all you have to do is to make vlan 20 and 2 communicated in layer
< 2,
< > I think you need to configure Vlan-bridge in either CAT 1 or CAT2 .
< >
< > Jongsoo
< >
< > On 5/12/05, ccie2be < ccie2be@nyc.rr.com <mailto:ccie2be@nyc.rr.com> >
< > wrote:
< > Hi guys,
< >
< > I'm trying to figure out how to configure this. I think dot.1q is the
< way
< > to go but I can't test this with the equipment I have.
< >
< > rtr-1 ------------- Cat-1 --- Cat-2 ----------------- rtr-2
< > .2 < vlan 2 > < vlan 20> .254
< >
< > | < 192.10.1.x/24 >|
< >
< > 802.1q trunks have been configured between the 2 3550's and both Cat's
< > have
< > their system mtu set as 1504.
< > I've configured each cat port connecting the rtr's as follows:
< >
< > Cat-1
< > interface FastEthernet0/2
< > switchport access vlan 2
< > switchport mode dot1q-tunnel
< > no ip address
< > no cdp enable <- added by default
< > spanning-tree bpdufilter enable <- added by default
< >
< > Cat-2
< > interface FastEthernet0/24
< > switchport access vlan 20
< > switchport mode dot1q-tunnel
< > no ip address
< > no cdp enable
< > spanning-tree bpdufilter enable
< >
< > With the rtr's I'm using I can't configure 802.1q trunking on the
< ethernet
< > ports connected to the Cat's. And, when I put the ip addr on the phy
< int,
< > pings don't work from rtr-1 to rtr-2.
< >
< > Am I approaching this problem correctly? If I were able to configure
< the
< > ethernet ports with 802.1q trunks, would this work?
< >
< > TIA, Tim
< >
< >
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