Introduction Reserved
Software Reference for SwitchBlade x3100 Series Switches (Internet Group Management
Protocol (IGMP))
5-4
5.3 Channel Usage for IGMP
5.3.1 Reserved
For the SBx3112, there is a subset of the reserved multicast address range of 224.0.0.x (x = 0..255):
• 01:00:5e:00:00:01 (All-Hosts Group).)
• 01:00:5e:00:00:02 (All Routers Group)
• 01:00:5e:00:00:04 (DVMRP)
• 01:00:5e:00:00:05 (OSPFALL)
• 01:00:5e:00:00:06 (OSPFDESIGNATED)
• 01:00:5e:00:00:09 (RIP2)
• 01:00:5e:00:00:0a (IGRP)
• 01:00:5e:00:00:0c (DHCPRELAY)
• 01:00:5e:00:00:0d (PIM)
• 01:00:5e:00:00:0e (RSVP)
• 01:00:5e:00:00:0f (CBT)
• 01:00:5e:00:00:12 (VRRP)
• 01:00:5e:00:00:23 (DXCLUSTER)
• 01:00:5e:00:00:65 (CISCONHAP)
• 01:00:5e:00:00:66 (HSRP)
• 01:00:5e:00:00:fb (MDNS)
Note: These reserved multicast entries do not take away from the 512 multicast groups supported by the
system.
5.3.2 User provisioned MCAST addresses
The SBx3112 system user can provision specific MCAST addresses that are considered important and are not
auto-populated. This allows the user to pass other application-specific protocols that are outside the reserved
multicast addresses that the SBx3112 system IGMP policy would otherwise block. With IGMP snooping
enabled and the port set to INTERNAL, reserved MCAST addresses (224.0.0.1->224.0.0.255) will be dropped
unless joined. For this reason, the system provides the user the ability to use CLI commands to statically con-
figure MCAST addresses that are considered important but are not auto-populated. Furthermore, this pro-
vides the ability to pass other application specific protocols that are outside the reserved multicast addresses
which the SBx3112 system IGMP policy would otherwise block.
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