Cisco Systems 2955 specifications Q. How granular can the rate limiting policing be set?

•Snooping on Protocol-Independent-Multicast (PIM) and Distance-Vector-Multicast-Routing-Protocol (DVMRP) packets

•Listening to Cisco Group Management Protocol self-join packets from other routers

•Statically connecting to a multicast router port with the ip igmp snooping mrouter command

You can configure the switch to either snoop on PIM/DVMRP packets or to listen to Cisco Group Management Protocol self-join packets. By default, the switch snoops on PIM/DVMRP packets on all VLANs. To learn of multicast router ports through only Cisco Group Management Protocol self-join packets, use the ip igmp snooping vlan vlan_id mrouter learn cgmp global configuration command. When this command is used, the router listens only to Cisco Group Management Protocol self-join packets and no other Cisco Group Management Protocol packets. To learn of multicast router ports through only PIM/DVMRP packets, use the ip igmp snooping vlan vlan_id mrouter learn pim-dvmrpinterface command.

Q. How granular can the rate limiting policing be set?

A. The granularity of policers is 1 Mbps on Fast Ethernet ports and 8 Mbps on Gigabit Ethernet ports. The Cisco Catalyst 2955 supports 6 policers on 10/100 ports and up to 60 policers on Gigabit Ethernet ports. Please note that this feature is available on the Cisco Catalyst 2955T, 2955C, and 2955S switches.

Q. Is rate limiting supported? Is traffic shaping supported?

A. Rate limiting is supported. Traffic shaping is not supported.

Q. What are the default CoS values on the Cisco Catalyst 2955?

A. The default CoS values are shown in Table 3.

Table 3 Default CoS Values

CoS Value	CoS Priority Queue
0,1	1
2,3	2
4,5	3
6,7	4

Q. What are the configurable ranges for Weighted Round Robin (WRR) bandwidth allocation to all queues of transmission?

A. WRR scheduling can be enabled to avoid starvation of frames in lower-priority queues by providing configurable bandwidth allocation, using a number of 1-255 per queue.

Q. Can IGMP snooping and QoS on the Cisco Catalyst 2955 be configured via Cisco CMS Software?

A. Yes. Cisco IOS Software Release 12.0(5)WC1 supports configuration of both IGMP snooping and QoS via Cisco CMS, using simple point-and-click menus for enabling and disabling the features, as well as configuring parameters.

Q. Does the Cisco Catalyst 2955 support the 802.3ad Port Grouping standard?

A.Yes.

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