Term
What is the default behavior of a L2 interface on a switch in regards to multicast traffic?
|
|
Definition
The default behavior for a L2 interface on a switch is to forward all mulitcast traffic to every L2 interface that belongs to the destination VLAN on the switch.
|
|
|
Term
What is one of the disadvantages of using IGMP snooping for multicast traffic management?
|
|
Definition
Because IGMP transmits messages as IP multicast packets, a switch running IGMP snooping must examine every multicast data packet to determine whether it contains pertinent IGMP control information.
|
|
|
Term
Describe how CGMP is used to manage multicast traffic.
|
|
Definition
CGMP is a Cisco-developed protocol that allows Catalyst switches to learn about the existance of multicast clients from Cisco routers and L3 switches. The basis of CGMP is that the IP multicast router sees all IGMP traffic, and therefore, can inform the switch when specific hosts join or leave multicast groups.
|
|
|
Term
Describe the communication between a L2 and L3 device when using CGMP.
|
|
Definition
When a router sees an IGMP control packet, the router creates a CGMP packet. This packet contains the request type, the multicast group address, and the actual MAC address of the client. The packet is sent to all switches, which interprets the packet and creates the proper entries in a forwarding table.
|
|
|
Term
What command globally enables multicast routing on L3?
|
|
Definition
|
|
Term
What command enables PIM on an interface that requires multicasting?
|
|
Definition
ip pim [dense-mode | sparse-mode | sparse-dense-mode]
|
|
|
Term
What command configures the address of the RP?
|
|
Definition
| ip pim rp-address ip-address [access-list] [override] |
|
|
Term
What command enables a specific version of PIM on a router?
|
|
Definition
|
|
Term
What command enables IGMP snooping on a Catalyst switch?
|
|
Definition
|
|
Term
What command is used to display the contents of the multicast routing table?
|
|
Definition
| show ip mroute [hostname | group-number] |
|
|
Term
What commmand displays information about the currently elected BSR?
|
|
Definition
|
|
Term
What command displays the RP that was selected for the specified group?
|
|
Definition
| show ip pim rp-hash group |
|
|
Term
What command displays information about IGMP snooping configured interfaces?
|
|
Definition
show ip igmp snooping mrouter interface
|
|
|
Term
What command displays IGMP snooping information on a vlan interface?
|
|
Definition
| show ip igmp interface vlan-id |
|
|
Term
What command deletes entries from the IP multicast routing table?
|
|
Definition
|
|
Term
What command deletes all group entries the Catalyst switches have cached?
|
|
Definition
|
|
Term
What command deletes specific entries from the IGMP cache?
|
|
Definition
| clear ip igmp group [group-name | group-address | interface] |
|
|
Term
What command enables IP IGMP snooping fast leave on a Catalyst 6500 switch?
|
|
Definition
ip igmp snooping fast-leave
|
|
|
Term
What command enables IGMP snooping fast leave on any Catalyst switch except a 6500 series?
|
|
Definition
ip igmp snooping immediate-leave
|
|
|
