From: Brian McGahan (brian@cyscoexpert.com)
Date: Tue Mar 18 2003 - 18:24:02 GMT-3
Stephen,
There are two network types and three IS-IS hello (IIH) types in
IS-IS. The two network types are broadcast and point-to-point. The
three hello types are L1 LAN, L2 LAN, and point-to-point. Neighbors
cannot be adjacent unless the hello types match.
Multipoint interfaces such as Ethernet, Token-Ring, and
Frame-Relay and ATM main and multipoint subinterfaces are network type
broadcast, and use L1 and L2 LAN hellos, depending on which level they
are running. Point to point interfaces such as ISDN, HDLC, and
point-to-point Frame-Relay and ATM are network type point-to-point, and
send P2P hellos.
As of 12.2(8)T you can send p2p hellos on a broadcast media by
using the 'isis network point-to-point'. Other than that, the network
type is based on the interface type.
There is plenty of info on IS-IS on CCO, you just have to know
where to look. You're not really going to find a better source for it
unless you read the RFCs:
RFC3373 - Three-Way Handshake for Intermediate System to Intermediate
System (IS-IS) Point-to-Point Adjacencies
RFC3359 - Reserved Type, Length and Value (TLV) Codepoints in
Intermediate System to Intermediate System
RFC3277 - Intermediate System to Intermediate System (IS-IS) Transient
Blackhole Avoidance
RFC2973 - IS-IS Mesh Groups
RFC2966 - Domain-wide Prefix Distribution with Two-Level IS-IS
RFC2763 - Dynamic Hostname Exchange Mechanism for IS-IS
RFC1195 - Use of OSI IS-IS for routing in TCP/IP and dual environments
RFC1142 - OSI IS-IS Intra-domain Routing Protocol
For more info on IS-IS on CCO:
http://www.cisco.com/pcgi-bin/Support/browse/psp_view.pl?p=Internetworki
ng:ISIS
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866.CyscoXP
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> steve r
> Sent: Tuesday, March 18, 2003 12:27 PM
> To: Bernard; ccielab@groupstudy.com
> Subject: ISIS INFO NEEDED
>
> I been looking in cisco's sites and docs on ISIS and its topology with
> frame
> point to point and multipoint to different interfaces and
> subinterfaces.(All
> I found was some what worthless)
> Does any one have any info OUTSIDE of Cisco on ISIS and its behavior
with
> frame-relay interfaces
> OR Any Real World Experience on ISIS from ISPs.??
>
> (please hold back on the canned answer of use point to point to point
to
> point, or interface to interface only ).
> The complex problems of ISIS using different interfaces types have
> turned
> me on to shooting in dark, with trial and error to get things working
with
> redistribution with other protocols.
>
> Stephen R
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