Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
show ip mfib
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:
• 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.
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,
IC - Internal Copy
Interface Flags: A - Accept, F - Forward, NS - Signal,
NP - Not platform switched
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 Description
clear ip mfib counters Clears the global MFIB counters and the counters for all
active MFIB routes.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E