Traffic/Security Filters and Monitors

Filter Types and Operation

Table 11-2. Multicast Filter Limits

Max-VLANs

Maximum # of Multicast Filters (Static and

Setting

IGMP Combined)

 

 

1 (the minimum)

420

8 (the default)

413

32 or higher

389

 

 

N o t e s

C a u t i o n

Per-Port IP Multicast Filters. The static multicast filters described in this section filter traffic having a multicast address you specify. To filter all multicast traffic on a per-VLAN basis, refer to the section titled “Configuring and Displaying IGMP” in the chapter titled “Multimedia Traffic Control with IP Multicast (IGMP)” in the Multicast and Routing Guide for your switch.

IP Multicast Filters. Multicast filters are configured using the Ethernet format for the multicast address. IP multicast addresses occur in the range of

224.0.0.0through 239.255.255.255 (which corresponds to the Ethernet multi­ cast 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.

If Spanning Tree is enabled, then the MSTP multicast MAC address (0180c2­ 000000) should not be filtered. (STP will not operate properly if the MSTP multicast MAC address is filtered.)

Protocol Filters

This filter type enables the switch to forward or drop, on the basis of protocol type, traffic to a specific set of destination ports on the switch. Filtered protocol types include:

■

AppleTalk

■

NetBEUI

■

ARP

■

SNA

■IPX

11-16