Allied Telesis Patch 86261-04 Instrukcja Użytkownika Pobierz pdf (Strona 30)

30 SHOW IGMPSNOOPING ROUTERADDRESS Patch Release Note

Patch 86261-07 for Software Release 2.6.1

C613-10388-00 REV G

MAC address are now deleted from the all the internal tables for ports

where the learn limit has been exceeded.

On AT-8800 series switches, strict QoS scheduling is now enforced for ports

where egress rate limiting is applied. On Rapier i series switches, the same

QoS setup is now applied to all of the appropriate ports when setting up

egress rate limiting.

When saving the IP filter configuration, non-default values for the source IP

address mask were not always saved correctly. This issue has been resolved.

On AT-8800 series switches, if a port was set to use 10 Mbps full duplex with

the SET SWITCH PORT SPEED=10MBFULL command, there was a delay

before the port was set. This delay has been minimised.

On AT-8800 series switches, the temperature at which a temperature alarm

is generated has been increased.

Uplink modules on Rapier series switches sometimes did not enable a link

correctly. This issue has been resolved.

IGMP Snooping All-Group Entry

Because IGMP is an IP-based protocol, multicast group membership for VLAN

aware devices is on a per-VLAN basis. If at least one port in the VLAN is a

member of a multicast group, multicast packets will be flooded onto all ports in

the VLAN by default.

IGMP snooping enables the switch to forward multicast traffic intelligently on

the switch. The switch listens to IGMP membership reports, queries and leaves

messages to identify the switch ports that are members of multicast groups.

Multicast traffic will only be forwarded to ports identified as members of the

specific multicast group.

This enhancement allows network managers to prevent specified ports from

acting as IGMP all-group ports, and specify which ports are allowed to behave

as all-group entry ports, by using the ENABLE IP IGMP ALLGROUP

command.

For example, consider a video streaming service which has 15 channels. When

the switch receives IGMP membership reports destined for the address

239.0.0.2 from an unauthorised user, all 15 channels of multicast data floods to

that port, which may affect the service of the network. In order to avoid this,

the network manager decides whether or not to allow a particular port to

behave as an IGMP all-group port, e.g. port 8. Then, whenever the above IGMP

PCR: 03952 Module: SWI Level: 3

PCR: 03953 Module: SW56 Level: 3

PCR: 03969 Module: IPG Level: 2

PCR: 03976 Module: SW56 Level: 3

PCR: 03979 Module: CORE Level: 3

PCR: 31037 Module: SW56 Level: 2

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