From: marc van hoof (mvh@marcvanhoof.com)
Date: Tue Aug 03 2004 - 22:37:51 GMT-3
Just out of interest, i rented one of the IE racks and tried to do one
of their sample labs, but the IOS image didn't have IS-IS in it...
anyone else had this ?
-marc.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Wednesday, August 04, 2004 11:12 AM
To: Edwards, Andrew M; Group Study
Subject: Re: IRB question
Thanks again, Andy.
But, I thought proxy arp is enabled by default so I shouldn't have to
explicitly enable it. ( I'll try this tomorrow - right now I don't have
access the to the rack.)
Also, I understand the thinking behind changing R3's mask (and R1's mask
also I presume), but I'm concerned that that would screw up other parts
of
the lab that come later on.
BTW, this scenario comes from IE practice lab 3 and my config matches
what's
shown in the solution guide. So, I'm fairly confident this should work
without messing around with these other things. Do you agree?
Could this be related to the version of IOS running on the routers? or
switches?
I'm working on IE's rental rack and their routers & switches are running
very recent versions of IOS.
Tim
----- Original Message -----
From: "Edwards, Andrew M" <andrew.m.edwards@boeing.com>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study"
<ccielab@groupstudy.com>
Sent: Tuesday, August 03, 2004 8:02 PM
Subject: RE: IRB question
> Yes it is one of those contrived and weird situations.... But my point
> was that, although R1 should see R3 as on its local Layer2 segment
(e.g.
> ARP resolvable), the truth is that they are on two separate L2
segments
> (e.g. VLANS). The ARP debug should prove that to you...
>
> My suggestion to get around it was essentially fooling R6 into
thinking
> it was a proxy-arp server for R1 to reach R3. The classic problem
where
> the SA inputs the wrong subnet mask so R6 fixes that problem for
them...
> Yes, magic to the SA, but makes my skin crawl. 8)
>
> HTH,
>
> Andy
>
> -----Original Message-----
> From: ccie2be [mailto:ccie2be@nyc.rr.com]
> Sent: Tuesday, August 03, 2004 4:24 PM
> To: Group Study; Edwards, Andrew M
> Subject: Re: IRB question
>
>
> Hi Andy,
>
> Thanks for your response. This is certainly an interesting problem,
> don't ya think?
>
> I will try those things you suggested and see what happens. But, you
> confirmed for me the biggest question I had which was should R1 be
able
> to ping R3. I wasn't 100% sure that it should, so I didn't try to
debug
> this problem before knowing that in fact this was a problem.
>
> Thanks for getting back to me on this.
>
> Tim
> ----- Original Message -----
> From: "Edwards, Andrew M" <andrew.m.edwards@boeing.com>
> To: "ccie2be" <ccie2be@nyc.rr.com>
> Sent: Tuesday, August 03, 2004 6:51 PM
> Subject: RE: IRB question
>
>
> I think the problem is that the switch you are trunked to does not
> forward between VLANS. So, do the debug arp and you should see that
R1
> sees R3 as directly connected, but it doesn't get ARP resolution
because
> the only way to get ARP resolution from the local subnet is via R6
> (because the switch wont forward between vlans).
>
> Possible resolution, place R3 into a subnet that is LARGER than /24
and
> enable Proxy arp on R6!!!!
>
> Andy
>
> -----Original Message-----
> From: ccie2be [mailto:ccie2be@nyc.rr.com]
> Sent: Tuesday, August 03, 2004 11:20 AM
> To: Group Study
> Subject: IRB question
>
>
> Hi guys,
>
> Here's the scenario.
>
> R1 <--> R6 <-->R3
>
> R6 has a BVI 1 configured and R6's fa1/0/0 is trunking. Here's the
> config:
>
> bridge irb
>
> interface FastEthernet1/0/0
> no ip address
> half-duplex
> !
> interface FastEthernet1/0/0.16
> encapsulation dot1Q 16
> bridge-group 1
> !
> interface FastEthernet1/0/0.36
> encapsulation dot1Q 36
> bridge-group 1
>
>
> interface BVI1
> ip address 136.7.136.6 255.255.255.0
>
> bridge 1 protocol ieee
> bridge 1 route ip
>
> R6 can ping both R1 and R3, but R1 can't ping R3. There are no acl's
or
> any other obvious (at least to me) reasons for this. I assume R1
should
> be able to ping R3. Can someone help me out?
>
> Thanks in advanced, Tim
>
>
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