Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 281)

Multi-Service IronWare Routing Configuration Guide 253
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IS-IS CLI levels
Three-way handshake for point-to-point adjacencies
Support was provided for Three-Way Handshake for Point-to-Point adjacencies as described in RFC
3373. This feature provides three-way handshake mechanisms on point-to-point interfaces for the
following benefits:
• Identifies neighbor restarts within the holding time period
• Identifies uni-directional link failures and stops forming of an adjacency with a peer where
such link failures occur.
NOTE
This feature is the default operation and cannot be turned off. Brocade devices with this feature are
fully backward compatible with Brocade devices running an earlier release.
IS-IS CLI levels
The CLI includes various levels of commands for IS-IS. Figure 19 diagrams these levels.
FIGURE 19 IS-IS CLI levels
The IS-IS CLI levels are as follows:
• A global level for the configuration of the IS-IS protocol. At this level, all IS-IS configurations at
this level apply to IPv4 and IPv6. You enter this layer using the router isis command.
• Under the global level, you specify an address family. Address families to separate the IS-IS
configurations for IPv4 and IPv6. You enter configurations that are for a specific You enter
this level by entering the address-family command at the router isis level.
• Under the address family level, you select a sub-address family, which is the type of routes
for the configuration. For IS-IS, you specify unicast.
• An interface level.
Global configuration level
You enter the global configuration level of IS-IS by entering the following command.
Brocade(config)#router isis
Brocade(config-isis-router)#
Syntax: [no] router isis
The (config-isis-router)# prompt indicates that you are at the global level for IS-IS. A configuration
that you enter at this level applies to both IS-IS IPv4 and IS-IS IPv6.