BigIron RX Series Configuration Guide 13553-1001986-01CAM partitioning for the BigIron RX 5The total amount of CAM entries available is 1024 for each packet processor. If you want toconfigure 600 for ACLs, 168 for PBR and Rate Limiters, and 256 for IPv6 multicast forwardingentries, enter commands such as the following.BigIron RX(config)#cam-partition rw session 768BigIron RX(config)#cam-partition rw session rule-partition 600If you want to configure 2 ACL entries and 2 IPv6 entries and 1020 Rate Limiting entries, enter acommand such as the following.BigIron RX(config)#cam-partition rw session 1022BigIron RX(config)#cam-partition rw session rule-partition 2Syntax: cam-partition rw session Syntax: cam-partition rw session rule-partition The "cam-partition rw session xx" command allocates xx entries of the 1024 entries toACLs+(RL/QoS/PBR) and 1024-xx to the IPv6 multicast entries.The "cam-partition rw session rule-partition yy" command gives the yy of xx entries to ACLs andxx-yy entries to RL/QoS/PBR entries.NOTEA reload is required after a CAM partition command is configured for the CAM partition to takeeffect.Nexthop tableThe nexthop table on BigIron RX line cards contains next hop entries that are used by the routingtable entries to route IP traffic. One or more routes can point to the same next hop. Entries fordirectly connected hosts are also present in the nexthop table. The nexthop table has 4096 entriesper line card by default. This table is divided into four partitions. First partition contains next hopentries for routes with one routing path. This included directly connected host entries. Secondpartition contains next hop entries for routes with two or less equal cost paths. Allocation from thispartition is always done in blocks of two entries. Third partition contains next hop entries for routeswith four or less equal cost paths. Allocation from this partition is always done in blocks of fourentries. The fourth partition contains next hop entries for routes with eight or less equal cost paths.Allocation from this partition is always done in blocks of eight entries. For a given route, the nexthop entry is allocated based on the path count and best-fit algorithm. For example, to create a nexthop entry for a route with three equal cost paths, the entries are allocated from the four-pathpartition. Four entries will be allocated from four-path partition even if the route has three equalcost paths. If the four-path partition is full, the entries are allocated from the next partition, which isthe eight-path partition.The Nexthop table is partitioned as follows:• One-path partition: 2816 entries• Two-path partition: 512 entries• Four-path partition: 512 entries• Eight-path partition: 256 entriesNOTEA reload is required after a CAM partition command is configured for the CAM partition to takeeffect.
