What does the function of the TLV 132 in LSP ?

In ISIS protocol,what is the function of the TLV 132 in LSP? It seems like routers choose the latest active interface on the box,is it right ?

Hello WL,
the TLV 132 is present in hello packets but also on the LSP both L1 and L2 and contains the ip address(es) of the transmitting interface
As explained in the previous post this TLV allows the receiving router(s) to perform a check of adjancency validity from the point of view of IPv4.
Probably the TLV 132 is present in the LSP for two reasons:
for completeness and for providing a fast check about the usage of the LSP.
The LSP indeed is a list of TLVs so implementation can also be a little redundant here by putting all TLVs into the LSP.
This also means that the LSP sent out each interface is different in TLV 132 field.
You can see with sh isis database detail that each LSP contains a list of IP subnets and associated metric costs this can come from a list of TLV 132.
TLV 128-132 are defined in RFC1195 for IP routing with IS-IS.
IP Interface Address -- the IP address(es) of the interface
corresponding to the SNPA over which this PDU is to be transmitted.
x CODE - 132
x LENGTH - total length of the value field (four octets per address).
x VALUE -
It is TLV 128 that provides metric info for IP.
Hope to help
Giuseppe

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