ISIS point-to-point three-way handshake

[Mahesh Gohil]

HI,

I was going through adjacency options for isis p2p and broadcast network. For broadcast isis have mechanism for three-way handshake

but for point-to-point link there must be p2p three-way handshake TLV present and here is the confusion.

I captured some packets through GNS lab and seen that there is no such TLV present but still it behave like a three-way.

kindly look at packet 8,9,10,11 for attached wireshark capture. Need to know how it hello mechanism work for p2p link.

Regards

Mahesh

[Vaclav.Pokorny4]

you can see that TLV 240 is present in IS-IS Hello packet but it's not carrying the information which should according to RFC 3373, so I would that feature wasn't implemented in that software release

V. 

[SASipraPK]

you have to give "isis three-way-handshake ietf" command on interface to have 15byte TLV 

Point-to-point Adjacency State (t=240, l=15)
   Type: 240
   Length: 15
   Adjacency State: Up (0)
   Extended Local circuit ID: 0x00000100
   Neighbor SystemID: 0101.0100.0002
   Neighbor Extended Local circuit ID: 0x00000000