RE: [nsp] dot1q/isl "encapsulation failed"

From: Stephane Perez (perezs@nortelnetworks.com)
Date: Fri Mar 09 2001 - 04:20:40 EST


  Hwllo,

  Why have you put an IP address on the Ethernet Interface ??

>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
>!

 As long as I can remember you cannot have ISL/DOT1q encapsulation on an
Ethernet Interface, If you do this, the Ethernet can map the exact
encapsulation type, and also VLan's tag.
  You should try to remove the FE address place in shutdown and place after
in no shut.

 regards
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------
PEREZ Stephane
Carrier IP Specialist
Nortel Networks
ATS IP Core Infrastructure
25, allee Pierre Ziller
06560 Valbonne, FRANCE
Phone: +33 4 92 96 18 05 Mail : perezs@nortelnetworks.com
Fax : +33 4 92 96 16 68 www : http://www.nortelnetworks.com
Esn : 296-1805 Intranet :
http://hector.europe.nortel.com

-----Original Message-----
From: Andrew [mailto:arousch@home.com]
Sent: 09 March 2001 05:45
To: Dmitri Kalintsev; cisco-nsp@puck.nether.net
Subject: Re: [nsp] dot1q/isl "encapsulation failed"

encap failed is layer3's way of telling you that there is something wrong
in a layer below it. Where is 10.1.1.6?

At 11:20 PM 3/8/01 +0200, Dmitri Kalintsev wrote:
>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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