Show Ip Mfib - Cisco Catalyst 4500 Series Command Reference Manual

show ip mfib

show ip mfib
To display all active Multicast Forwarding Information Base (MFIB) routes, use the show ip mfib
command.
Syntax Description all
counters
log
n
Defaults
This command has no default settings.
Command Modes
Privileged EXEC mode
Command History Release
12.1(8a)EW
12.2(40)SG
Usage Guidelines
In the Supervisor Engine 6-E and Catalyst 4900M chassis, the output of the show ip mfib command does
not display any hardware counters.
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. These flags
are associated with MFIB routes:
•
•
•
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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show ip mfib [all | counters | log [n]]
(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.
(Optional) Specifies the counts of MFIB-related events. Only nonzero counters are
shown.
(Optional) Specifies a log of the most recent number of MFIB-related events. The most
recent event is first.
(Optional) Number of events.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Support for command introduced on the Supervisor Engine 6-E and Catalyst 4900M
chassis.
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.
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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