Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

Enabling IS-IS

By default, IS-IS is not enabled.

The system supports one instance of IS-IS. To enable IS-IS globally, create an IS-IS routing process and assign a NET address. To exchange protocol information with neighbors, enable IS-IS on an interface, instead of on a network as with other routing protocols.

In IS-IS, neighbors form adjacencies only when they are same IS type. For example, a Level 1 router never forms an adjacency with a Level 2 router. A Level 1-2 router forms Level 1 adjacencies with a neighboring Level 1 router and forms Level 2 adjacencies with a neighboring Level 2 router.

NOTE: Even though you enable IS-IS globally, enable the IS-IS process on an interface for the IS-IS process to exchange protocol information and form adjacencies.

To configure IS-IS globally, use the following commands.

Create an IS-IS routing process. CONFIGURATION mode router isis [ tag] tag: (optional) identifies the name of the IS-IS process.
Configure an IS-IS network entity title (NET) for a routing process. ROUTER ISIS mode net network-entity-title Specify the area address and system ID for an IS-IS routing process. The last byte must be 00. For more information about configuring a NET, refer to IS-IS Addressing.
Enter the interface configuration mode. CONFIGURATION mode interface interface Enter the keyword interface then the type of interface and slot/port information:
- For the Loopback interface on the RPM, enter the keyword loopback then a number from 0 to 16383.
- For a port channel, enter the keywords port-channel then a number from 1 to 255.
- For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
- For a VLAN, enter the keyword vlan then a number from 1 to 4094.
Enter an IPv4 Address. INTERFACE mode ip address ip-address mask Assign an IP address and mask to the interface. The IP address must be on the same subnet as other IS-IS neighbors, but the IP address does not need to relate to the NET address.
Enter an IPv6 Address. INTERFACE mode ipv6 address ipv6-address mask
- ipv6 address: x:x:x:x::x
- mask: The prefix length is from 0 to 128.
The IPv6 address must be on the same subnet as other IS-IS neighbors, but the IP address does not need to relate to the NET address.
Enable IS-IS on the IPv4 interface. ROUTER ISIS mode ip router isis [ tag] If you configure a tag variable, it must be the same as the tag variable assigned in step 1.
Enable IS-IS on the IPv6 interface. ROUTER ISIS mode ipv6 router isis [ tag] If you configure a tag variable, it must be the same as the tag variable assigned in step 1.

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.

Example of Viewing IS-IS Configuration ( EXEC Privilege Mode)

Dell#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
                                 GigabitEthernet 4/22
                                 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
                                 Dell#

To view IS-IS protocol statistics, use the show isis traffic command in EXEC Privilege mode.

Example of the show isis traffic Command

Dell#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
                                 Dell#

You can assign more NET addresses, but the System ID portion of the NET address must remain the same. The Dell 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.

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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

Enabling IS-IS

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