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# Features

Some of the major IS-IS features supported by the router include:

- Optimization of route leaking from level 1 to level 2
- Equal-cost paths maximum 16 equal paths
- Adjacency and LSP overrun
- Dynamic resolution of hostnames to system IDs
- Mesh groups
- Configurable LSP transmit and throttle intervals
- Route redistribution policies based on access lists between IS-IS levels
- Three-way handshake for point-to-point adjacencies
- Simple text and HMAC MD5 authentication
- Support for bigger metric TLVs
- Domain-wide prefix distribution
- Traffic engineering for MPLS
- 32-bit (4-octet) route tags
- Table maps
- Graceful restart
- IPv6 routing

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