Allied Telesis 86251-08 manual Static Igmp, Show IP Icmpreply

62 SHOW IP ADVERTISE Patch Release Note

SHOW IP ICMPREPLY

Syntax SHOW IP ICMPREPLY

Description This command display the status of configurable ICMP messages (Figure

Figure 4: Example output from the SHOW IP ICMPREPLY command:

SHOW IP ICMP REPLY MESSAGES

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ICMP REPLY MESSAGES:
Network Unreachable	disabled
Host Unreachable	disabled
Redirect	enabled

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Table 5: Parameters in the output of the SHOW IP ICMPREPLY command.

Parameter	Meaning
ICMP Reply Messages	A list of ICMP configurable reply messages and whether
	they are enabled or disabled.

Static IGMP

This section describes an enhancement to the Internet Group Management

Protocol (IGMP), which is supplied as a patch on Software Releases 2.5.1 for

Rapier i Series switches.

It is possible to have a network segment that either has no multicast group members, or has a host that is unable to report its group membership with IGMP. In such cases, no multicast traffic is sent to the network segment. This enhancement provides a mechanism for the user to pull down multicast traffic to the segment.

Currently the switch forwards multicast data on a dynamic basis to hosts who have joined the multicast group. This enhancement allows the user to instruct the switch to forward multicast data over a specified interface and port, as shown in Figure 6 on page 63. This capability is essential for sending multicast traffic to hosts that cannot report their group membership with IGMP. It plays an important role in video over ADSL applications.

Figure 6 on page 63 illustrates a switch forwarding the multicast stream to a set-top box after a user specifies that group 224.1.1.1 multicast data should be forwarded out of port 4 of VLAN1.

Unlike conventional IGMP membership, this user-specified static membership never times out.

The user will also be able to filter some IGMP debug messages by source IP address and group destination address.

Patch 86251-08 for Software Release 2.5.1 C613-10356-00 REV I