Cisco Catalyst 4500 Series Command Reference Manual page 819

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
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 the ingress packets should be treated and whether packets matching the route
should be forwarded onto interface 1. These per-interface flags are associated with the MFIB routes:
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Examples
This example shows how to display all active MFIB routes:
Switch# show ip mfib
IP Multicast Forwarding Information Base
Entry Flags: C - Directly Connected, S - Signal,
Interface Flags: A - Accept, F - Forward, NS - Signal,
Packets: Fast/Partial/Slow Bytes: Fast/Partial/Slow:
(171.69.10.13, 224.0.1.40), flags (IC)
Packets: 2292/2292/0, Bytes: 518803/0/518803
Vlan7 (A)
Vlan100 (F NS)
Vlan105 (F NS)
(*, 224.0.1.60), flags ()
Packets: 2292/0/0, Bytes: 518803/0/0
Vlan7 (A NS)
(*, 224.0.1.75), flags ()
Vlan7 (A NS)
(10.34.2.92, 239.192.128.80), flags ()
Packets: 24579/100/0, 2113788/15000/0 bytes
Vlan7 (F NS)
Vlan100 (A)
(*, 239.193.100.70), flags ()
Packets: 1/0/0, 1500/0/0 bytes
Vlan7 (A)
Switch#
Related Commands Command
clear ip mfib counters
OL-27596 -01
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.
Forwarding (F)—Used with the A flag as described above. The set of forwarding interfaces together
form a multicast olist or output interface list.
Signaling (S)—Set on an interface when a multicast routing protocol process in Cisco IOS needs to
be notified of ingress packets on that interface.
Not Platform (NP) fast-switched—Used with the F flag. A forwarding interface is also marked as
Not Platform fast-switched whenever that output interface cannot be fast-switched by the platform
hardware and requires software forwarding.
For example, the Catalyst 4506 switch with Supervisor Engine III cannot switch tunnel interfaces in
hardware so these interfaces are marked with the NP flag. When an NP interface is associated with
a route, a copy of every ingress packet arriving on an Accepting interface is sent to the switch
software forwarding path for software replication and then forwarded to the NP interface.
IC - Internal Copy
NP - Not platform switched
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
Description
Clears the global MFIB counters and the counters for all
active MFIB routes.
show ip mfib
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