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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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IS-IS Administrative Tag

IS-IS Administrative Tag

Administrative tags control the advertisement of IP prefixes in an IS-IS routing domain to simplify route management. You can use administrative tags to control the import of routes of different levels and different areas and control IS-IS multi-instances running on the same router.

Figure 7-11 IS-IS networking

In Figure 7-11, RouterA in Area 4 needs to communicate with RouterB in Area 5, RouterC in Area 3, and RouterD in Area 2. To ensure information security, it is required that other routers in Level-1 areas (Areas 2, 3, and 5) should not receive the packets sent from RouterA. To meet this requirement, configure the same administrative tag for IS-IS interfaces on RouterB, RouterC, and RouterD and configure the Level-1-2 router in Area 4 to leak only the routes matching the configured administrative tag from Level-2 to Level-1 areas. This allows RouterA to communicate with only RouterB, RouterC, and RouterD. Figure 7-12 shows the topology formed on RouterA.

Figure 7-12 IS-IS administrative tag application

The value of an administrative tag is associated with certain attributes. If the cost-style is wide, wide-compatible or compatible, when IS-IS advertises an IP address prefix with these attributes, IS-IS adds the administrative tag to the TLV in the prefix. The tag is flooded along with the prefix throughout the routing domain.

Updated: 2019-03-21

Document ID: EDOC1000166601

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