Cisco 4500M Command Reference

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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
show ip mfib
show ip mfib
To display all active Multicast Forwarding Information Base (MFIB) routes, use the show ip mfib
command.
show ip mfib [all | counters | log [n]]
Syntax Description
Defaults This command has no default settings.
Command Modes Privileged EXEC
Command History
Usage Guidelines The MFIB table contains a set of IP multicast routes; each route in the MFIB table contains several flags
that associate to the route.
The route flags indicate how a packet that matches a route is forwarded. For example, the IC flag on an
MFIB route indicates that some process on the switch needs to receive a copy of the packet. The
following flags are associated with MFIB routes:
• Internal Copy (IC) flag—Set on a route when a process on the switch needs to receive a copy of all
packets matching the specified route.
• Signaling (S) flag—Set on a route when a switch process needs notification that a packet matching
the route is received. In the expected behavior, the protocol code updates the MFIB state in response
to having received a packet on a signaling interface.
• Connected (C) flag—When set on a route, the C flag has the same meaning as the S flag, except that
the C flag indicates that only packets sent by directly connected hosts to the route should be signaled
to a protocol process.
A route can also have a set of flags associated with one or more interfaces. For an (S,G) route, the flags
on interface 1 indicate how ingress packets should be treated and whether packets matching the route
should be forwarded onto interface 1. The following per-interface flags are associated with MFIB routes:
• Accepting (A)—Set on the RPF interface when a packet that arrives on the interface and that is
marked as Accepting (A) is forwarded to all Forwarding (F) interfaces.
all (Optional) Specifies all routes in the MFIB, including those routes that are used to
accelerate fast switching but that are not necessarily in the upper-layer routing protocol
table.
counters (Optional) Specifies the counts of MFIB-related events. Only non-zero counters are
shown.
log (Optional) Specifies a log of the most recent number of MFIB-related events. The most
recent event is first.
n (Optional) Specifies the number of events.
Release Modification
12.1(8a)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English