3Com Switch 7700, Configuration Manual

Page: 144 / 390

136 C
HAPTER
5: IP R
OUTING
P
ROTOCOL
O
PERATION
If the level is not specified, it defaults to setting the CSNP packet broadcast interval
for Level-1.
By default, the CSNP packet is transmitted by an interface every 10 seconds.
Setting the LSP Packet Interval
LSP carries the link state records for propagation throughout the area.
Perform the following configuration in VLAN interface view..
By default, the minimum time between the consecutive transmissions of 2 LSPs is
33 milliseconds.
Setting the LSP Packet Retransmission Interval
If the local end does not receive a response within a period of time after it sends
an LSP packet over a
p2p link, it assumes that the LSP packet has been lost or
dropped. To guarantee transmission reliability, the local router will retransmit the
original LSP packet.
Perform the following configurations in VLAN interface view..
By default, the LSP packet is transmitted every 5 seconds over the p2p link.
Setting the Hello Failure Interval
The IS-IS protocol maintains adjacency between routers by transmitting and
receiving Hello packets. If the local router does not continuously receive Hello
packets within the time interval transmitted by the peer, it considers the adjacent
router to be down.
Perform the following configurations in VLAN interface view..
Table 61 Setting the LSP Packet Interval
Operation Command
Set LSP packet interval on the interface,
measured in milliseconds. isis timer lsp time
Restore the default LSP packet interval on the
interface undo isis timer lsp
Table 62 Setting LSP Packet Retransmission Interval
Operation Command
Set the retransmission interval of the LSP
packet over
p2p links
isis timer retransmit seconds
Restore the default retransmission interval of
the LSP packet over
p2p links
undo isis timer retransmit
Table 63 Setting the Hello Failure Interval on the Interface
Operation Command
Set the Hello failure interval on the interface isis timer dead seconds [ level-1 | level-2 ]
Restore the default Hello failure interval on
the interface undo isis timer dead [ level-1 | level-2 ]