Skip to main content
Sign Out

Welcome to Dell

My Account
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Enjoy members-only rewards and discounts
  • Create and access a list of your products
  • Manage your Dell EMC sites, products, and product-level contacts using Company Administration.
Sign In Create an Account Dell Financial Services Premier Sign In Partner Program Sign In
Contact Us

Your Dell.com Carts

Dell Configuration Guide for the S4048–ON System 9.14.2.4

PDF

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.

  1. Create an IS-IS routing process.
    CONFIGURATION mode
    router isis [tag]
    tag: (optional) identifies the name of the IS-IS process.
  2. 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.
  3. Enter the interface configuration mode.
    CONFIGURATION mode
    interface interface
    Enter the keyword interface then the type of interface and slot/port information:
    • For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port/subport[/subport] information.
    • For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
    • For a Loopback interface, enter the keyword loopback then a number from 0 to 16383.
    • For a port channel interface, enter the keywords port-channel then a number.
    • For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
  4. 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.
  5. 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.
  6. 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.
  7. 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.

Examples of the show isis Commands

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
  TenGigabitEthernet 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
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.

Rate this content

Accurate
Useful
Easy to understand
Was this article helpful?
0/3000 characters
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please select whether the article was helpful or not.
  Comments cannot contain these special characters: <>()\