I Pmc - Black Box LPB2910A User Manual

2-­‐11 I PMC
ICMP is an acronym for Internet Control Message Protocol. It is a protocol that generates the error
response, diagnostic, or routing purposes. ICMP messages generally contain information about
routing d ifficulties o r s imple e xchanges s uch a s t ime-­‐stamp o r e cho t ransactions.
2-­‐11.1 I GMP S nooping
The function is used to enable the multicast groups to forward the multicast packet to the member
ports, and avoids wasting the bandwidth while IP multicast packets are running over the network.
This i s b ecause a s witch t hat d oes n ot s upport I GMP o r I GMP S nooping c annot t ell a m ulticast p acket
from a broadcast packet, so it can only treat them all as broadcast packets. Without IGMP Snooping,
the m ulticast p acket f orwarding f unction w orks t he s ame a s i t d oes f or a b roadcast p acket.
A switch supported IGMP Snooping with the functions of query, report, and leave, a type of packet
exchanged between IP Multicast Router/Switch and IP Multicast Host, can update the information of
the Multicast table when a member (port) joins or leaves an IP Multicast Destination Address. With
this f unction, o nce a s witch r eceives a n I P m ulticast p acket, i t w ill f orward t he p acket t o t he m embers
who j oined a s pecified I P m ulticast g roup b efore.
The packets will be discarded by IGMP Snooping if the user transmits multicast packets to the
multicast group that had not been built up in advance. IGMP mode enables the switch to issue the
IGMP function that you enable IGMP proxy or snooping on the switch, which connects to a router
closer to the root of the tree. This interface is the upstream interface. The router on the upstream
interface s hould b e r unning I GMP.
2-­‐11.1.1 B asic C onfiguration
The section describes how to set the basic IGMP snooping on the switch, which connects to a router
closer to the root of the tree. This interface is the upstream interface. The router on the upstream
interface s hould b e r unning I GMP.
Web I nterface
To c onfigure t he I GMP S nooping p arameters i n t he w eb i nterface:
1. Click C onfiguration, I PMC, I GMP S nooping, B asic C onfiguration.
2. Select e nable o r d isable f or a G lobal c onfiguration.
3. Select w hich p ort w ill b e a R outer P ort o r e nable/disable t he F ast L eave f unction..
4. Scroll t o s et t he T hrottling p arameter.
5. Click A pply t o s ave t he s etting.
6. To c ancel t he s etting, c lick t he R eset b utton. I t w ill r evert t o p reviously s aved v alues.
Figure 2 -­‐12.1.1: The I GMP S nooping C onfiguration.
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Publication date: Sept, 2015
Revision A1