IS-IS Configuration

Overview of IS-IS

ISIS protocol can implement the interworking of large-scale networks.

Configuration Precautions for IS-IS

Configuring Basic IPv4 IS-IS Functions

This section describes how to configure basic IPv4 IS-IS functions.

Configuring IPv4 IS-IS Route Selection

Configuring IS-IS route selection can achieve refined control over route selection.

Configuring IPv4 IS-IS to Interact with Other Routing Protocols

If other routing protocols are configured on an IS-IS network, configure IS-IS to interact with these protocols for communication between them.

Adjusting the IPv4 IS-IS Route Convergence Speed

Accelerating IS-IS route convergence can improve the fault location efficiency and network reliability.

Configuring an IS-IS Multi-Instance Process

To reduce the interface count and configuration workload required by multiple conventional IS-IS processes, you can configure IS-IS multi-instance processes. A conventional IS-IS process and multiple IS-IS multi-instance processes can be configured on the same interface.

Enabling the Advertisement of IPv4 Delay Information

To allow IS-IS to collect and flood information about the intra-area IPv4 link delay, you can enable the advertisement of IPv4 delay information for an IS-IS process.

Configuring an IS-IS Process to Advertise IPv4 Packet Loss Rates

Configuring an IS-IS process to advertise IPv4 packet loss rates helps ensure that service traffic is transmitted along the path with the lowest packet loss rate.

Configuring Static BFD for IS-IS

BFD can provide link fault detection featuring light load and high speed (within milliseconds). Static BFD needs to be configured.

Configuring Dynamic BFD for IS-IS

BFD can provide link failure detection featuring light load and high speed (within milliseconds). With dynamic BFD, routing protocols can dynamically trigger the establishment of BFD sessions.

Configuring IS-IS IPv4 MT to Isolate Multicast Services from Unicast Services

On an IS-IS IPv4 network, IS-IS multi-topology (MT) improves usage of network resources by allowing services to run in multiple logical topologies.

Configuring IPv4 IS-IS Route Summarization

To speed up IPv4 route lookup and simplify route management on a large-scale IS-IS network, configure IS-IS route summarization to reduce the number of IS-IS routes in a routing table.

Configuring IS-IS Auto FRR

This section describes how to configure IS-IS Auto FRR.

Configuring Basic IPv6 IS-IS Functions

This section describes how to configure basic IPv6 IS-IS functions for communication between nodes on an IPv6 IS-IS network. The configuration procedure includes configuring the IS-IS process and IS-IS interface.

Configuring IPv6 IS-IS Route Selection

Configuring IS-IS route selection can achieve refined control over route selection.

Configuring IPv6 IS-IS to Interact with Other Routing Protocols

If other routing protocols are configured on an IS-IS network, configure IS-IS to interact with these protocols for communication between them.

Adjusting the IPv6 IS-IS Route Convergence Speed

Accelerating IS-IS route convergence can improve the fault location efficiency and network reliability.

Enabling the Advertisement of IPv6 Delay Information

To allow IS-IS to collect and flood information about the intra-area IPv6 link delay, you can enable the advertisement of IPv6 delay information for an IS-IS process.

Configuring an IS-IS Process to Advertise IPv6 Packet Loss Rates

Configuring an IS-IS process to advertise IPv6 packet loss rates helps ensure that service traffic is transmitted along the path with the lowest packet loss rate.

Configuring IS-IS Neighbor Relationship Flapping Suppression

IS-IS neighbor relationship flapping suppression works by delaying IS-IS neighbor relationship reestablishment or setting the link cost to the maximum value.

Disabling IS-IS Interface Flapping Suppression

IS-IS interface flapping suppression is globally enabled by default. If this function is not needed, you can disable it.

Disabling Routing Loop Detection for Routes Imported to IS-IS

Configuring IS-IS Purge LSP Source Tracing

IS-IS purge LSP source tracing improves the efficiency in locating the fault that triggers IS-IS LSP purge.

Configuring Dynamic BFD for IPv6 IS-IS

BFD provides link failure detection featuring light load and high speed (within milliseconds). With dynamic BFD, routing protocols can dynamically trigger the establishment of BFD sessions.

Configuring IS-IS IPv6 MT to Isolate Multicast Services from Unicast Services

On an IS-IS IPv6 network, IS-IS MT improves usage of network resources by allowing services to run in multiple logical topologies.

Configuring IS-IS MT to Isolate IPv4 Services from IPv6 Services

On an IS-IS network, IS-IS MT improves usage of network resources by allowing multiple logical topologies to be deployed.

Configuring IPv6 IS-IS Route Summarization

To speed up IPv6 route lookup and simplify route management on a large-scale IS-IS network, configure IS-IS route summarization to reduce the number of IS-IS routes in a routing table.

Configuring IPv6 IS-IS Auto FRR

With IPv6 IS-IS Auto FRR, traffic on a faulty link can be quickly switched to an alternate link, which minimizes traffic interruption and improves IS-IS network reliability.

Configuring an IS-IS Link Group

If one of the links that are load-balancing traffic fails, traffic may get lost. To prevent traffic loss, configure an IS-IS link group.

Configuring IS-IS Local MT

With IS-IS local multicast topology (MT), multicast traffic can be transmitted over a traffic engineering (TE) tunnel, and the router through which the tunnel passes can generate multicast forwarding entries.

Improving IS-IS Network Security

On a network that requires high security, you can configure IS-IS authentication.

Configuring Whitelist Session-CAR for IS-IS

You can configure whitelist session-CAR for IS-IS to isolate bandwidth resources by session for IS-IS packets. This configuration prevents bandwidth preemption among IS-IS sessions in the case of a traffic burst.

Configuring Micro-Isolation CAR for IS-IS

Maintaining IS-IS

Maintaining IS-IS involves resetting IS-IS, clearing IS-IS statistics, and debugging IS-IS.

IS-IS Configuration Examples

This section describes IS-IS configuration examples.