User guide

Configuring IS-IS Configuring IS-IS
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide March 2015 page 3-23
The following table shows the various interface parameters that can be set:
These parameters can be added any time. In broadcast networks, the DIS sends CSNP packets to maintain
database synchronization. For example, to configure the CSNP PDUs time interval to 50 seconds, enter
the following:
-> ip isis vlan 101 csnp-interval 50
To set the LSP interval to 120 seconds, enter the following:
-> ip isis vlan 101 lsp-pacing-interval 120
To set the LSP retransmit interval to 100 seconds, enter the following:
-> ip isis vlan 101 retransmit-interval 100
Configuring Redistribution Using Route Maps
It is possible to configure the IS-IS protocol to advertise routes learned from other routing protocols (AS-
external routes) into the IS-IS network. Such a process is referred to as route redistribution and is
configured using the ip redist command.
IS-IS redistribution uses route maps to control how external routes are learned and distributed. A route
map consists of one or more user-defined statements that can determine which routes are allowed or
denied access to the IS-IS network. In addition a route map may also contain statements that modify route
parameters before they are redistributed.
When a route map is created, it is given a name to identify the group of statements that it represents. This
name is required by the ip redist command. Therefore, configuring IS-IS route redistribution involves the
following steps:
1 Create a route map, as described in “Using Route Maps” on page 3-24.
2 Configure redistribution to apply a route map, as described in “Configuring Route Map Redistribu-
tion” on page 3-27.
ip isis vlan csnp-interval Configures the time interval in seconds to send Complete Sequence
Number PDUs (CSNP) from the specified VLAN circuit.
ip isis vlan lsp-pacing-interval Configures the interval between IS-IS Link State PDUs (LSP) sent
from the specified circuit.
ip isis vlan retransmit-interval Configures the minimum time between Link State PDU (LSP)
transmissions on a point-to-point interface.
ip isis vlan interface-type Configures the IS-IS interface (circuit) type as broadcast or point-to-
point.
Note. The retransmit interval should be greater than the expected round-trip delay between two devices.
This will avoid any needless retransmission of PDUs.