From: Tomasz Szymanski (tomasz.szymanski@trecom.pl)
Date: Wed Jul 30 2003 - 17:04:08 GMT-3
Thanks Brian,
These mechanism are familiar to me but thank you for your (as always)
great reply.
Anyway I wanted to know methods of configuring ISIS on ATM.
TS
Brian McGahan wrote:
>Tomasz,
>
> IS-IS, like OSPF, uses periodic hello messages to establish and
>maintain an active neighbor adjacency. Unlike OSPF, however, IS-IS has
>no built in method to manage on demand circuits. Therefore, if
>IS-IS hello packets (protocol CLNS_IS) are listed as interesting
>traffic, the DDR link will remain up indefinitely.
>
> Since there are no built in DDR management mechanisms for IS-IS,
>we must use some other protocol independent methods. These methods
>include dialer-watch and backup interface.
>
> With dialer-watch, the watch-list *is* the interesting traffic,
>therefore there is no need to specify CLNS_IS as interesting. With
>backup interface on the other hand, CLNS_IS should be specified as
>interesting traffic if you want IS-IS hellos to initiate a call once the
>interface in question comes out of standby. Keep in mind that backup
>interface does not initiate a DDR call, it simply takes the interface
>out of standby mode once the primary interface is down.
>
>
>HTH,
>
>Brian McGahan, CCIE #8593
>bmcgahan@internetworkexpert.com
>Cell: 708-362-1418
>
>Internetwork Expert, Inc.
>http://www.InternetworkExpert.com
>
>
>
>
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>>
>>
>Of
>
>
>>Tomasz Szymanski
>>Sent: Wednesday, July 30, 2003 1:16 PM
>>To: ccielab@groupstudy.com
>>Subject: ISIS on Frame-Relay and DDR (IPexpert lab 26)
>>
>>Hello group,
>>
>>I have touched the problem of ISIS running on frame relay network I'd
>>like to share with you.
>>
>>When configuring ISIS on point-to-point subinterfaces there is no
>>additional configuration needed (besides "ip router isis"). When you
>>configure ISIS on multipoint subinterfaces (what is not a recommended
>> solution but exam is not real life) you have to configure "fram relay
>>map clns" to make ISIS work. That's because LAN LSPs are sent over
>>multipoint interfaces.
>>
>>When configuring ISIS over DDR there is also a need for mapping clns
>>
>>
>to
>
>
>>dialstring.
>>
>>Does someone know a document that describes how to configure ISIS on
>>
>>
>ATM
>
>
>>point-to-point and multipoint interfaces?
>>
>>What are preferred methods for backup on ISDN in networks using ISIS
>>(dialer watch is one of them but is it preferred)?
>>
>>TS
>>
>>
>>
>>
>>
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