The following information describes router configuration guidelines:
A system interface and associated IP address should be specified.
Boot options file (BOF) parameters must be configured before configuring router parameters.
IPv4 and IPv6 route table lookup entries are shared. Before adding routes for IPv6 destinations, route entries in the routed lookup table needs to be allocated for IPv6 addresses. This can be done using the config system resource-profile max-ipv6-routes CLI command. This command allocates route entries for /64 IPv6 prefix route lookups. The system does not allocate any IPv6 route entries by default and user needs to allocate some resources before using IPv6. For the command to take effect the node must be rebooted after making the change. See the 7210 SAS-Mxp, R6, R12, S, Sx, T Basic System Configuration Guide for more information.
A separate route table (or a block in the route table) must be used for IPv6 /128-bit prefix route lookup. A limited number of IPv6 /128 prefixes route lookup entries are supported. The software enables lookups in this table by default, so no user configuration is required to enable IPv6 /128-bit route lookup.
IPv6 interfaces are allowed to be created without allocating IPv6 route entries; only IPv6 hosts on the same subnet are reachable.
In 7210 SAS, the FIB is shared among all routing instances (Base instance, management instance, and VPRN service instances).
Software shuts down control protocols (for example, OSPF) if the routing FIB (either IPv4 FIB or IPv6 FIB) size limit is exceeded. Users must ensure through proper network design that the FIB size is not exceeded. Use the available tools (that is, route policies) to ensure that all the features that share the IPv4/IPv6 FIB do not install routes more than the available FIB size.