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Port Traffic Controls

Traffic/Security Filters

Filter Types and Operation

Multicast Filters

This filter type enables the switch to forward or drop multicast traffic to a

specific set of destination ports. This helps to preserve bandwidth by reducing

multicast traffic on ports where it is unnecessary, and to isolate multicast

traffic to enhance security.

You can configure up to 16 static multicast filters (defined by the filter

command—page

13-5). However, if an IGMP-controlled filter for a joined

multicast group has the same multicast address as a static multicast filter

configured on a given port, the IGMP-controlled filter will override the static

multicast filter configured on that port. Note that in the default configuration,

IGMP is disabled on a VLAN configured in the switch. To enable IGMP on a

specific VLAN, use the vlan < vid > ip igmp command. (For more on this

command, refer to the chapter titled “Multimedia Traffic Control with IP

Multicast (IGMP)” in the Advanced Traffic Management Guide for your

switch.)

The total of static multicast filters and IGMP multicast filters together can

range from 389 to 420, depending on the current max-vlans setting in the

switch.

Table 13-2. Maximum Allowed Number of Multicast Filters

Max-VLANs

Setting

Maximum # of Multicast Filters

(Static and IGMP Combined)

1 (the minimum) 420

8 (the default) 413

32 or higher 389

Note : IP Multicast Filters. Multicast filters are configured using the Ethernet

format for the multicast address. IP multicast addresses occur in the range

from 224.0.0.0 through 239.255.255.255 (which corresponds to the Ethernet

multicast address range of 01005e-000000 through 01005e-7fffff). Any static

Traffic/Security filters configured with a multicast filter type and a multicast

address in this range will continue to be in effect unless IGMP learns of a

multicast group destination in this range. In this case, IGMP takes over the

filtering function for the multicast destination address(es) for as long as the

IGMP group is active. If the IGMP group subsequently deactivates, the static

filter resumes control over traffic to the multicast address.

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HP 5300 Informações Técnicas Página 250