Users Guide

Table Of Contents
The default IS type is level-1-2. To change the IS type to Level 1 only or Level 2 only, use the is-type command in ROUTER
ISIS mode.
To view the IS-IS configuration, enter the show isis protocol command in EXEC Privilege mode or the show config
command in ROUTER ISIS mode.
DellEMC#show isis protocol
IS-IS Router: <Null Tag>
System Id: EEEE.EEEE.EEEE IS-Type: level-1-2
Manual area address(es):
47.0004.004d.0001
Routing for area address(es):
21.2223.2425.2627.2829.3031.3233
47.0004.004d.0001
Interfaces supported by IS-IS:
Vlan 2
twentyFiveGigE 1/2
Loopback 0
Redistributing:
Distance: 115
Generate narrow metrics: level-1-2
Accept narrow metrics: level-1-2
Generate wide metrics: none
Accept wide metrics: none
DellEMC#
To view IS-IS protocol statistics, use the show isis traffic command in EXEC Privilege mode.
DellEMC#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
DellEMC#
You can assign more NET addresses, but the System ID portion of the NET address must remain the same. Dell EMC
Networking OS 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.
450
Intermediate System to Intermediate System