Configuration Information - Dell C9000 Series Networking Configuration Manual

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new IPv6 protocol identifier has also been included in the supported TLVs. The new TLVs use the extended

metrics and up/down bit semantics.

Multi-topology IS-IS adds TLVs:

MT TLV — contains one or more Multi-Topology IDs in which the router participates. This TLV is

included in IIH and the first fragment of an LSP.

MT Intermediate Systems TLV — appears for every topology a node supports. An MT ID is added to the

extended IS reachability TLV type 22.

MT Reachable IPv4 Prefixes TLV — appears for each IPv4 an IS announces for a given MT ID. Its

structure is aligned with the extended IS Reachability TLV Type 236 and it adds an MT ID.

MT Reachable IPv6 Prefixes TLV — appears for each IPv6 an IS announces for a given MT ID. Its

structure is aligned with the extended IS Reachability TLV Type 236 and add an MT ID.

By default, the system supports dynamic host name exchange to assist with troubleshooting and

configuration. By assigning a name to an IS-IS NET address, you can track IS-IS information on that address

easier. The system does not support ISO CLNS routing; however, the ISO NET format is supported for

To support IPv6, the Dell Networking implementation of IS-IS performs the following tasks:

Advertises IPv6 information in the PDUs.

Processes IPv6 information received in the PDUs.

Computes routes to IPv6 destinations.

Downloads IPv6 routes to the RTM for installing in the FIB.

Accepts external IPv6 information and advertises this information in the PDUs.

The following table lists the default IS-IS values.

Table 39. IS-IS Default Values

IS-IS Parameter

Complete sequence number PDU (CSNP) interval

IS-to-IS hello PDU interval

IS-IS interface metric

Metric style

Designated Router priority

Circuit Type

Equal Cost Multi Paths

Configuration Information

To use IS-IS, you must configure and enable IS-IS in two or three modes: CONFIGURATION ROUTER ISIS,

CONFIGURATION INTERFACE, and ( when configuring for IPv6) ADDRESS-FAMILY mode. Commands in

ROUTER ISIS mode configure IS-IS globally, while commands executed in INTERFACE mode enable and

configure IS-IS features on that interface only. Commands in the ADDRESS-FAMILY mode are specific to IPv6.

Default Value

Level 1 and Level 2

Intermediate System to Intermediate System