IP Router Configuration Command Reference
108 Router Configuration Guide
ip-fast-reroute
Syntax [no] ip-fast-reroute
Context config>router
Description This command enables IP Fast-Reroute (FRR) feature on the system.
This feature provides for the use of a Loop-Free Alternate (LFA) backup next-hop for forwarding in-
transit and CPM generated IP packets when the primary next-hop is not available. IP FRR is supported
on IPv4 and IPv6 OSPF/IS-IS prefixes forwarded in the base router instance to a network IP interface
or to an IES SAP interface or spoke interface. It is also supported for VPRN VPN-IPv4 OSPF prefixes
and VPN-IPv6 OSPF prefixes forwarded to a VPRN SAP interface or spoke interface.
IP FRR also provides a LFA backup next-hop for the destination prefix of a GRE tunnel used in an
SDP or in VPRN auto-bind.
When any of the following events occurs, IGP instructs in the fast path on the XMAs to enable the LFA
backup next-hop:
• OSPF/IS-IS interface goes operationally down: physical or local admin shutdown.
• Timeout of a BFD session to a next-hop when BFD is enabled on the OSPF/IS-IS interface
When the SPF computation determines there is more than one primary next-hop for a prefix, it will not
program any LFA next-hop in RTM. Thus, the IP prefix will resolve to the multiple equal-cost primary
next-hops that provide the required protection.
The no form of this command disables the IP FRR feature on the system
Default no ip-fast-reroute
mc-maximum-routes
Syntax mc-maximum-routes number [log-only] [threshold threshold]
no mc-maximum-routes
Context config>router
Description This command specifies the maximum number of multicast routes that can be held within a VPN
routing/forwarding (VRF) context. When this limit is reached, a log and SNMP trap are sent. If the log-
only parameter is not specified and the maximum-routes value is set below the existing number of
routes in a VRF, then no new joins will be processed.
The no form of the command disables the limit of multicast routes within a VRF context. Issue the no
form of the command only when the VPRN instance is shutdown.
Default no mc-maximum-routes
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