Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 1176)

1126 Brocade 6910 Ethernet Access Switch Configuration Guide
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Glossary and Acronyms
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IGMP
Internet Group Management Protocol. A protocol through which hosts can register with their local
router for multicast services. If there is more than one multicast switch/router on a given
subnetwork, one of the devices is made the “querier” and assumes responsibility for keeping track
of group membership.
IGMP Query
On each subnetwork, one IGMP-capable device will act as the querier — that is, the device that asks
all hosts to report on the IP multicast groups they wish to join or to which they already belong. The
elected querier will be the device with the lowest IP address in the subnetwork.
IGMP Proxy
Proxies multicast group membership information onto the upstream interface based on IGMP
messages monitored on downstream interfaces, and forwards multicast traffic based on that
information. There is no need for multicast routing protocols in an simple tree that uses IGMP
Proxy.
IGMP Snooping
Listening to IGMP Query and IGMP Report packets transferred between IP Multicast Routers and IP
Multicast host groups to identify IP Multicast group members.
In-Band Management
Management of the network from a station attached directly to the network.
IP Multicast Filtering
A process whereby this switch can pass multicast traffic along to participating hosts.
IP Precedence
The Type of Service (ToS) octet in the IPv4 header includes three precedence bits defining eight
different priority levels ranging from highest priority for network control packets to lowest priority for
routine traffic. The eight values are mapped one-to-one to the Class of Service categories by
default, but may be configured differently to suit the requirements for specific network
applications.
LACP
Link Aggregation Control Protocol. Allows ports to automatically negotiate a trunked link with
LACP-configured ports on another device.
Layer 2
Data Link layer in the ISO 7-Layer Data Communications Protocol. This is related directly to the
hardware interface for network devices and passes on traffic based on MAC addresses.
Layer 3
Network layer in the ISO 7-Layer Data Communications Protocol. This layer handles the routing
functions for data moving from one open system to another.