Users Guide

Version Description
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.5(0.1) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series.
7.8.1.0 Introduced on the C-Series on port-channels and the S-Series.
Usage
Information
The router with the largest value assigned to an interface becomes the designated router. If two
interfaces contain the same designated router priority value, the interface with the largest interface IP
address becomes the designated router.
ip pim graceful-restart
This feature permits configuration of non-stop forwarding (NSF or graceful restart) capability of a PIM router to its neighbors.
Syntax
[ipv6] ip pim graceful-restart {helper-only | nsf [restart-time | stale-
entry-time]}
Parameters
ipv6 Enter the keyword ipv6 to enable graceful-restart for the IPv6 multicast routes.
helper-only Enter the keywords helper-only to configure as a receiver (helper) only by
preserving the PIM status of a graceful restart PIM neighboring router.
nsf Enter the keyword nsf to configure the non-stop forwarding capability.
restart-time (OPTIONAL) Enter the keywords restart-time followed by the number of
seconds estimated for the PIM speaker to restart. The range is 30 to 300 seconds.
The default is 180 seconds.
stale-entry-time (OPTIONAL) Enter the keywords stale-entry-time followed by the number of
seconds for which entries are kept alive after restart. The range is 30 to 300
seconds. The default is 60 seconds.
Defaults as above
Command Modes CONFIGURATION
Command
History
Version Description
9.0(1.3) Introduced on the S5000.
8.2.1.0 Introduced on the E-Series ExaScale. Added the ipv6 option for the E-Series.
7.6.1.0 Introduced on the E-Series.
Usage
Information
When an NSF-capable router comes up, it announces the graceful restart capability and restart duration
as a Hello option. The receiving router notes the Hello option. Routers not NSF-capable discard the
unknown Hello option and adjacency is not affected.
When an NSF-capable router goes down, the neighboring PIM speaker preserves the states and
continues the forwarding of multicast traffic while the neighbor router restarts.
PIM-Sparse Mode (PIM-SM) 1257