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RE: ISIS over Ethernet posted 09/12/2001
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Thats an interesting occurance.  Did you by any chance capture the traffic during the adjacency formation?  So long as the multicasts propogate, I can't see any reason why ISL would create a problem.  

*********** REPLY SEPARATOR  ***********

On 9/12/2001 at 3:24 AM Nigel Taylor wrote:

>pete,
>     As we're on the topic of ISIS, I was working through an exercise that 
>involved ISIS being implemted over an ISL trunk in which case part of the 
>exercise called for the connection to be routed over a bridged interface. 
> 
>In my testing the connection shows up as a ES-IS type and would not form a 
>full adjacency.
>
>Any thoughts..
>
>>From: "Peter Van Oene" <pvo@xxxxxxxxxxxx>
>>Reply-To: "Peter Van Oene" <pvo@xxxxxxxxxxxx>
>>To: ccielab@xxxxxxxxxxxxxx
>>Subject: RE: ISIS over Ethernet
>>Date: Tue, 11 Sep 2001 08:58:58 -0400
>>
>>This is a common misconception.  ISIS does not use CLNS(CLNP) for 
>>transport.  ISIS uses a direct layer two encapsulation.  No idea on the 
>>multicast drops though :)
>>
>>
>>*********** REPLY SEPARATOR  ***********
>>
>>On 9/7/2001 at 7:32 AM perkinsr@xxxxxxxxxxxxxx wrote:
>>
>> >Jason nailed it.  I put a crossover cable between R5 and R6 and the
>> >adjacency formed.  I don't know what the switch is doing to stop the
>> >multicasts.  I setup eigrp and ospf using that switch which also use
>> >multicasts and those work fine.  Those are IP to Ethernet multicasts 
>>while
>> >ISIS uses CLNS to Ethernet multicasts, I don't know if that makes a
>> >difference.
>> >
>> >Ray
>> >
>> >
>> >
>> >-----Original Message-----
>> >From: rsevier [mailto:rsevier@xxxxxxxxxxxxxxxxxxx]
>> >Sent: Thursday, September 06, 2001 8:31 PM
>> >To: perkinsr@xxxxxxxxxxxxxx
>> >Subject: RE: ISIS over Ethernet
>> >
>> >
>> >post some deb isis adj and let's see if we can find anything there.
>> >
>> >Raymond
>> >
>> >-----Original Message-----
>> >From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
>> >perkinsr@xxxxxxxxxxxxxx
>> >Sent: Thursday, September 06, 2001 3:33 PM
>> >To: ccielab@xxxxxxxxxxxxxx
>> >Subject: ISIS over Ethernet
>> >
>> >
>> >I can't get ISIS adjacencies to form over ethernet.  Connectivity and
>> >config
>> >are at the end.  I have tried several different NET addresses from with 
>>the
>> >doccd or the Doyle book.  All three routers will form ajacencies over
>> >serial
>> >and R4 has a token interface it will form an adjacency over.  If I give 
>>the
>> >CLNS Enable command on the ether interfaces they will form an ES-IS
>> >adjacency.  When doing debug ISIS adj-events every router says it is
>> >transmitting L1 and L2 IIH packets, but no of the routers see any hellos
>> >coming in.  The interfaces are up/up, ping and cdp are working over
>these
>> >links.
>> >
>> >The problem boils down to all router say they are transmitting hellos
>but
>> >no
>> >of the routers say they are recieving hellos.
>> >
>> >
>> >
>> >
>> >3620(R4)-----2924-----3620(R6)
>> >	      |
>> >	      |
>> >	      |
>> >	      |
>> >	2514(R5)
>> >
>> >and the essential config info is:
>> >R4:
>> >clns routing
>> >
>> >interface Ethernet0/0
>> > ip address 40.40.40.4 255.255.255.0
>> > ip router isis
>> >
>> >router isis
>> > net 01.0000.0004.0004.00
>> >
>> >R5:
>> >clns routing
>> >
>> > interface Ethernet0
>> > ip address 40.40.40.5 255.255.255.0
>> > ip router isis
>> >
>> >router isis
>> > net 01.0000.0005.0005.00
>> >
>> >R6:
>> >clns routing
>> >
>> >interface Ethernet0/0
>> > ip address 40.40.40.6 255.255.255.0
>> > ip router isis
>> >
>> >router isis
>> > net 01.0000.0006.0006.00
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