 | Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |
A link-state PDU (LSP) contains information about each router in the network and the connected interfaces. Also included is metric and IS-IS neighbor information. Each LSP must be refreshed periodically on the network and is acknowledged by information within a sequence number packet.
On point-to-point links, each LSP is acknowledged by a partial sequence number PDU (PSNP), but on broadcast links, a complete sequence number PDU (CSNP) is sent out over the network. Any router that finds newer LSP information in the CSNP then purges the out-of-date entry and updates the link-state database.
LSPs support variable-length subnet mask addressing.
| Copyright © 2009, Juniper Networks, Inc. All rights reserved. Trademark Notice. | |