Hi Amit, Regarding LSP MTU: (I'd assume the default size is below 1500 so 1492 seems right). My notes from an old book: max LSP size = 1492 bytes - header = 27 bytes == 1465 bytes for TLVs. LSP ID contains 8bit fragment id = max 256 fragments. => 256*1465 to pack ip reachability. -assuming the first fragment will carry some other TLVs. ==>aprox 31,000 prefixes.
My findings regarding CLSN MTU: In case the hello padding is disabled ISIS still sends IIH padded to the full interface MTU -3B until the adjacency is formed. XR 4.2.3 will form ISIS adjacency with a remote system if incoming IIH is max 5bytes larger than the interface CLNS MTU over which the IIH was received. adam _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
