Reference Guide

Accept wide metrics: none
FTOS#
To view IS-IS protocol statistics, use the show isis traffic command in EXEC Privilege mode.
Example of the show isis traffic Command
FTOS#show isis traffic
IS-IS: Level-1 Hellos (sent/rcvd) : 4272/1538
IS-IS: Level-2 Hellos (sent/rcvd) : 4272/1538
IS-IS: PTP Hellos (sent/rcvd) : 0/0
IS-IS: Level-1 LSPs sourced (new/refresh) : 0/0
IS-IS: Level-2 LSPs sourced (new/refresh) : 0/0
IS-IS: Level-1 LSPs flooded (sent/rcvd) : 32/19
IS-IS: Level-2 LSPs flooded (sent/rcvd) : 32/17
IS-IS: Level-1 LSPs CSNPs (sent/rcvd) : 1538/0
IS-IS: Level-2 LSPs CSNPs (sent/rcvd) : 1534/0
IS-IS: Level-1 LSPs PSNPs (sent/rcvd) : 0/0
IS-IS: Level-2 LSPs PSNPs (sent/rcvd) : 0/0
IS-IS: Level-1 DR Elections : 2
IS-IS: Level-2 DR Elections : 2
IS-IS: Level-1 SPF Calculations : 29
IS-IS: Level-2 SPF Calculations : 29
IS-IS: LSP checksum errors received : 0
IS-IS: LSP authentication failures : 0
FTOS#
You can assign more NET addresses, but the System ID portion of the NET address must remain the same. FTOS
supports up to six area addresses.
Some address considerations are:
• In order to be neighbors, configure Level 1 routers with at least one common area address.
• A Level 2 router becomes a neighbor with another Level 2 router regardless of the area address configured.
However, if the area addresses are different, the link between the Level 2 routers is only at Level 2.
Configuring Multi-Topology IS-IS (MT IS-IS)
To configure multi-topology IS-IS (MT IS-IS), use the following commands.
1. Enable multi-topology IS-IS for IPv6.
ROUTER ISIS AF IPV6 mode
multi-topology [transition]
Enter the keyword transition to allow an IS-IS IPv6 user to continue to use single-topology mode while
upgrading to multi-topology mode. After every router has been configured with the transition keyword, and all
the routers are in MT IS-IS IPv6 mode, you can remove the transition keyword on each router.
NOTE: When you do not enable transition mode, you do not have IPv6 connectivity between routers operating
in single-topology mode and routers operating in multi-topology mode.
2. Exclude this router from other router’s SPF calculations.
ROUTER ISIS AF IPV6 mode
set-overload-bit
3. Set the minimum interval between SPF calculations.
ROUTER ISIS AF IPV6 mode
spf-interval [level-l | level-2 | interval] [initial_wait_interval
[second_wait_interval]]
Use this command for IPv6 route computation only when you enable multi-topology. If using single-topology mode,
to apply to both IPv4 and IPv6 route computations, use the spf-interval command in CONFIG ROUTER ISIS
mode.
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