Allied Telesis Patch 86261-04 Manuel d'utilisateur télécharger pdf (Page 44)

44 add ip filter Patch Release Note

Patch 86261-09 for Software Release 2.6.1

C613-10388-00 REV J

add ip filter

Syntax ADD IP FILter=filter-number {ACTion=INCLude|EXCLude}

SOurce=ipadd [SMask=ipadd] [ENTry=entry-number] [other-

parameters]

Description This command adds a pattern to a routing filter. For details about the

command parameters, see Table on page 44

Parameters for the BGP route import feature in the add ip f

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

Parameter Option/Range Description

filter-number

300...399

Filters in the range 300 to 399 are treated as routing filters, and use the action

parameter to specify the action to take with a route that matches the pattern.

ACTion The action to take when the filter pattern is matched.

INCLude Route information matching the filter will be included.

EXCLude Route information matching the filter will be excluded.

SOurce The source IP address, in dotted decimal notation, for the filter pattern.

SMask The mask, in dotted decimal notation, to apply to source addresses for this pattern.

The mask is used to determine the portion of the source IP address in the IP packet

that is significant for comparison with this pattern. The values of source and smask

must be compatible. For each bit in smask which is set to zero (0) the equivalent bit

in source must also be zero (0). If source is not 0.0.0.0, then smask can not be

0.0.0.0. The default is 255.255.255.255, unless source is 0.0.0.0.

ENTry entry-number The entry parameter specifies the entry number in the filter which this new pattern

occupy. Existing patterns with the same or higher entry numbers are pushed down

the filter. The default is to add the new pattern to the end of the filter.

*Caps denote command shortcuts

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Allied Telesis Patch 86261-04 Manuel d'utilisateur Page 44

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