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Configuring Multicast Nonstop Forwarding
Command or Action
• accounting per-prefix forward-only
Example:
RP/0/RP0/CPU0:router(config-mcast-default-ipv)#
accounting per-prefix
Step 6
commit
Step 7
show mfib [vrf vrf-name] [ipv4 | ipv6] route [rate |
statistics] [* | source-address] [group-address
[/prefix-length] [detail | old-output] | summary] [location
node-id]
Example:
RP/0/RP0/CPU0:router# show mfib vrf 12 route
statistics location 0/1/cpU0
Configuring Multicast Nonstop Forwarding
This task configures the nonstop forwarding (NSF) feature for multicast packet forwarding for the purpose
of alleviating network failures, or software upgrades and downgrades.
Although we strongly recommend that you use the NSF lifetime default values, the optional
99
through
(PIM) and Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD). Use these
commands when PIM and IGMP (or MLD) are configured with nondefault interval or query intervals for join
and prune operations.
Generally, configure the IGMP NSF and PIM NSF lifetime values to equal or exceed the query or join query
interval. For example, if you set the IGMP query interval to 120 seconds, set the IGMP NSF lifetime to 120
seconds (or greater).
If the Cisco IOS XR Software control plane does not converge and reconnect after NSF is enabled on your
router, multicast packet forwarding continues for up to 15 minutes, then packet forwarding stops.
Before You Begin
For NSF to operate in your multicast network, you must also enable NSF for the unicast protocols (such as
IS-IS, OSPF, and BGP) that PIM relies on for Reverse Path Forwarding (RPF) information. See the appropriate
configuration modules to learn how to configure NSF for unicast protocols.
Cisco IOS XR Multicast Configuration Guide for the Cisco CRS Router, Release 5.2.x
98
Step 6, on page 100
allow you to modify the NSF timeout values for Protocol Independent Multicast
Implementing Multicast Routing on Cisco IOS XR Software
Purpose
punt) on every existing and new (S, G) route. The (*, G)
routes are assigned a single counter.
• accounting per-prefix forward-only—Enables one counter
on ingress and one on egress in hardware to conserve
hardware statistics resources. (Recommended for
configuration of multicast VPN routing or for any line
card that has a route-intensive configuration.)
Displays route entries in the Multicast Forwarding Information
Base (MFIB) table.
• When the rate keyword is used with the source- and
group-address, the command displays the cumulative
rates per route for all line cards in the Multicast
Forwarding Information Base (MFIB) table.
• When the statistics keyword is used, the command
displays the rate per route for one line card in the
Multicast Forwarding Information Base (MFIB) table.
Step 3, on page
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