Also be aware that running CEF on the fastethernet interface is
problematic with dot1q. Some versions of IOS specifically have it shut
off, others have it on. If you have global cef on "ip cef", then be
carefull.
Brian
On Tue, 20 Feb 2001, John Neiberger wrote:
> I just figured it out. There is a "feature" that was supposed to be
> fixed on the 2600 in this release, but it was not. I'm running 12.1(5)
> and they say this problem was fixed in anything after 12.1(3). Back
> then, the native VLAN IP address had to be configured on the major
> interface, not on a subinterface. I removed the subinterface for VLAN 1
> and configured it on the major interface and everything works great. If
> I upgrade to 12.1(6), I would have to go back to the normal method,
> placing the native VLAN on a subinterface like all the others.
>
> Regards,
> John
>
> >>> "Tim O'Brien" <[EMAIL PROTECTED]> 2/20/01 1:12:53 PM >>>
> That is very weird. Have you tried changing the encapsulation type and
> then
> rebooting both of the boxes to clear any "remains" out?
>
> Tim
>
> ----- Original Message -----
> From: "John Neiberger" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, February 20, 2001 2:57 PM
> Subject: Re: ARP issue with 802.1q Trunking
>
>
> Unfortunately, that doesn't even make sense in this scenario. I'm
> using
> a straight-through cable from the router to the switch, and ISL
> trunking
> is working great. I only get that error when I change the
> encapsulation
> type. Weird, huh?
>
> thanks,
> John
>
> >>> "Tim O'Brien" <[EMAIL PROTECTED]> 2/20/01 12:54:05 PM >>>
> The only thing that I could find is "Verify the cable selection
> (crossover
> versus non-crossover)".
>
> Tim
>
> ----- Original Message -----
> From: "John Neiberger" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, February 20, 2001 2:25 PM
> Subject: ARP issue with 802.1q Trunking
>
>
> I have a 2620 connected to a 2924XL using ISL trunking. Three VLANs
> configured on both sides, VLAN 1 is the management VLAN. I can ping
> from the router to the switch and vice versa.
>
> Now, I changed the encapulation type on both sides to dot1q and
> communication breaks. Turning on debugging, I found the following
> problem. Apparently, the 2620 is throwing out the ARP replies from
> the
> switch. Here is the output from debup arp:
>
> 00:15:09: IP ARP: sent req src 10.16.102.70 0030.8546.b740,
> dst 10.16.102.16 0000.0000.0000 FastEthernet0/0.1
> 00:15:09: IP ARP: sent req src 10.16.102.70 0030.8546.b740,
> dst 10.16.102.16 0000.0000.0000 FastEthernet0/0.1
> 00:15:09: IP ARP rep filtered src 10.16.102.16 0005.3214.99c0, dst
> 10.16.102.70
> 0030.8546.b740 wrong cable, interface FastEthernet0/0
> 00:15:09: IP ARP rep filtered src 10.16.102.16 0005.3214.99c0, dst
> 10.16.102.70
> 0030.8546.b740 wrong cable, interface FastEthernet0/0
>
> What the heck does wrong cable mean? The only potential problem I
> see
> is that it is sending the ARP request out fa0/0.1, but receiving the
> reply on fa0/0. Is there some configuration step that I'm missing?
> I've never tried to configure dot1q before, but it seems to me that if
> the native vlan is the same on both sides that the only configuration
> difference would be the encapsulation type on each side.
>
> Can any of you provide any advice concerning this? And changing back
> to ISL isn't going to solve my problem because I'm just playing around
> and I want to make this work! :-)
>
> Thanks,
> John
>
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>
> _________________________________
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I'm buying used CISCO gear!!
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Brian Feeny e:[EMAIL PROTECTED]
CCNP+Voice/ATM/Security p:318.222.2638x109
CCDP f:318.221.6612
Network Administrator
ShreveNet Inc. (ASN 11881)
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