From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu May 12 2005 - 17:59:48 GMT-3
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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