CGMP Command Summary

CGMP Command Summary

Tables 4-2 and 4-3 contain a summary of the router and switch commands pertaining to CGMP. The router command, ip cgmp proxy, will be covered in Chapter 5, “Distance Vector Multicast Routing Protocol.”

Table 4-2: Router CGMP Command Summary

Command

Description

ip cgmp

Enables CGMP on an interface or subinterface

ip cgmp proxy

Enables CGMP and DVMRP proxy on an interface or subinterface

clear ip cgmp [interface]

Clears all CGMP groups

show ip igmp interface [interface]

Shows if CGMP is enabled on an interface

debug ip cgmp

Debugs CGMP traffic

Table 4-3: Switch CGMP Command Summary

Command

Description

set cgmp enable

Enables CGMP on the switch

set cgmp disable

Disables CGMP on the switch

show multicast router

Lists the ports on the switch that are router ports

show multicast group

Displays active groups

clear cgmp statistics

Clears the CGMP statistics

debug ip cgmp

Debugs CGMP traffic

Example

View the switch CGMP statistics for VLAN 2

switch. show cgmp statistics 2

CGMP enabled

CGMP statistics for vlan 2:

valid rx pkts received257

invalid rx pkts received0

valid cgmp joins received252

valid cgmp leaves received5

valid igmp leaves received0

valid igmp queries received0

igmp gs queries transmitted0

igmp leaves transmitted0

failures to add GDA to EARL0

topology notifications received0

number of packets dropped0

Example

Verify the CGMP is enabled on the router

routerashow ip igmp interface ethernet 0

Ethernet0 is up, line protocol is up

Internet address is 172.16.4.3/24

IGMP is enabled on interface

Current IGMP version is 2

CGMP is enabled on interface

IGMP Query Interval is 60 seconds

IGMP Querier Timeout is 120 seconds

IGMP Max. Query Response Time is 10 seconds

Inbound IGMP Access group is not set

IGMP activity: 4 joins, 2 leaves

Multicast routing is enabled on interface

Multicast TTL threshold is 0

Multicast Designated Router (DR) is 172.16.4.3 (this system)

IGMP Querying router is 172.16.4.1

Multicast groups joined (number of users):

224.0.1.40(1) 225.250.250.1(1) cp5