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Link state routing

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TTL in LSP ensures that old LSP is eventually removed •

Creator of an LSP sets a maximum value of  (TTL) •

A node decrements ttl value of  the LSP while it is stored in the node •

When TTL reaches 0, the node deletes the LSP; it also floods the LSP with a TTL of 0, causing all nodes to delete that LSP..../////this is used to ensure that old information is removed from network...so that new information is may arrive...and also nodes have a limited buffer they cannot store every packet they receive due to flooding....after a while they have to delete that old lsp....it is also uesd to minimize the trafffic

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1 1 vote
Not only TTL but also sequence number as well as packet life time is also added in the link state routing packet.Bcz ,Sometimes packet struck into infinite loop within the AS.TO solve such problem we simply use TTL bcz it reduces each time when it passes through router.For removing duplication we use sequence number feild.
0 0 votes
The network adapter when picks up the frame it sees that TTL is 0 and discards the frame there itself, if there is no TTL filed in the frame then the frame with TTL 0 is also moved up to the high layers and the function of the upper layers is disturbed to prevent that TTL is used
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