From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu May 12 2005 - 18:48:27 GMT-3
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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