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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R010C00

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, OSPFv3, IS-IS(IPv4), IS-IS(IPv6), BGP, Routing Policy ,and PBR, and provides configuration examples.
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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 7-17  IS-IS networking

In Figure 1, 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 2 shows the topology formed on RouterA.

Figure 7-18  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.

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Updated: 2019-08-21

Document ID: EDOC1000141900

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