Try turning off CEF globally, if enabled. We had a very similar problem with
a 7206VXR, fixed this way.
JF
> -----Original Message-----
> From: Dmitri Kalintsev [mailto:dek@hades.uz]
> Sent: Thursday, March 08, 2001 4:21 PM
> To: cisco-nsp@puck.nether.net
> Subject: [nsp] dot1q/isl "encapsulation failed"
>
>
> Hi guys,
>
> I'm having rather hard time finding what's wrong in seemingly stupid
> situation:
>
> !
> interface FastEthernet0/0
> ip address <real ip address> 255.255.255.128
> no ip directed-broadcast
> full-duplex
> !
> interface FastEthernet0/0.1
> no ip redirects
> no ip directed-broadcast
> !
> interface FastEthernet0/0.77
> encapsulation dot1Q 77
> ip address 10.1.1.5 255.255.255.252
> no ip directed-broadcast
> !
>
> (I've tried no ip address on maininterface and f0/0.1 in dit1q vlan 1,
> result is the same).
>
> 7206-vpn-test#ping 10.1.1.6
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 10.1.1.6, timeout is 2 seconds:
>
> 19:41:37: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> sending
> 19:41:37: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> encapsulation failed.
> 19:41:39: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> sending
> 19:41:39: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> encapsulation failed.
> 19:41:41: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> sending
> 19:41:41: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> encapsulation failed.
> 19:41:43: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> sending
> 19:41:43: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> encapsulation failed.
> 19:41:45: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> sending
> 19:41:45: IP: s=10.1.1.5 (local), d=10.1.1.6
> (FastEthernet0/0.77), len 100,
> encapsulation failed.
> Success rate is 0 percent (0/5)
>
> I've tried to change dot1q to ISL, and result is the same,
> "encapsulation
> failed". FE works fine, if I don't use VLAN's. I've tried
> different IOS
> sets, too. Oh, yes. And a different router. First was 7206vxr
> with npe300
> and dual FE IO controller, this current one is 7206 with
> npe200 and vanilla
> IO controller. No difference.
>
> Switch side I presume is not guilty, as this very same switch
> runs a few
> dot1 trunks to other switches without problem. Switch is
> Cat2948, so it only
> supports dot1q trunks. Switch and router perfectly see each
> other on cdp
> neighbor list, too.
>
> 7206-vpn-test#sh int f0/0.77
> FastEthernet0/0.77 is up, line protocol is up
> Hardware is DEC21140A, address is 0004.de2f.8000 (bia
> 0004.de2f.8000)
> Internet address is 10.1.1.5/30
> MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation 802.1Q Virtual LAN, Vlan ID 77.
> ARP type: ARPA, ARP Timeout 04:00:00
>
> It seem to recognize that it's a VLAN interface, too...
>
> There is nothing really I can think of now, and what the hell
> should I think
> of? This is a simple configuration, as simple as it gets, and I had it
> working in dozens of other places. :( Any ideas?
>
> SY,
> --
> D.K.
>
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