WATERS NETWORK SYSTEMS
™ ProSwitch
®
-
2600M User’s Manual
Page
23
as part of VLAN group and not VLAN grouped with the other ports.
GVRP Protocol
In addition to network management tools that allow network administrators to statically add and delete VLAN
member ports, the 2600M supports GARP VLAN Registration Protocol (GVRP). GVRP supports the dynamic
registration of VLAN port members within a switch and across multiple switches. In addition to dynamically
updating registration entries within a switch, GVRP is used to communicate VLAN registration information to
other VLAN-aware switches, so that members of a VLAN can cover a wide span of switches in a network. GVRP
allows both VLAN-aware workstations and the 2600M to issue and revoke VLAN memberships. VLAN-aware,
the 2600M register and propagate VLAN membership to all ports that are part of the active topology of the
VLAN.
IGMP Protocol (IGMP Snooping and IP Multicast Filtering)
The Internet Group Management Protocol (IGMP) runs between hosts and their immediate neighboring
multicast routers. The protocol's mechanisms allow a host to inform its local router that it wants to receive
transmissions addressed to a specific multicast group. Routers periodically query the LAN to determine if known
group members are still active. If there is more than one router on the LAN performing IP multicasting, one of
the routers is elected "querier" and assumes the responsibility of querying the LAN for group members. Based
on the group membership information learned from the IGMP, a router can determine which (if any) multicast
traffic needs to be forwarded to each of its "leaf" subnetworks. Multicast routers use this information, along with
a multicast routing protocol, to support IP multicasting across the Internet. IGMP provides the final step in an IP
multicast packet delivery service since it is only concerned with the forwarding of multicast traffic from the local
router to group members on directly attached subnetworks. The 2600M supports IP Multicast Filtering by:
Passively snooping on the IGMP Query and IGMP Report packets transferred between IP Multicast Routers
and IP Multicast host groups to learn IP Multicast group members.
Actively sending IGMP Query messages to solicit IP Multicast group members.
The purpose of IP multicast filtering is to optimize a switched network's performance, so multicast packets will
only be forwarded to those ports containing multicast group hosts members and routers instead of flooding to all
ports in the subnet (VLAN). The 2600M with IP multicast filtering/switching capability not only passively monitors
IGMP Query and Report messages, DVMRP Probe messages, PIM, and MOSPF Hello messages; they also
actively send IGMP Query messages to learn locations of multicast routers and member hosts in multicast
groups within each VLAN. Note, however, IGMP neither alters nor routes any IP multicast packets. Since IGMP
is not concerned with the delivery of IP multicast packets across subnetworks, an external IP multicast router is
needed if IP multicast packets have to be routed across different subnetworks.
To enable or disable GVRP and IGMP:
1. Select
Other Protocols
from the
Advanced Management
menu.
2. Highlight the item that you want to change and press
Enter
.
3. Select the new setting for the item from the prompt screen and press
Enter
.
4. Press
Esc
to return to the Main Menu.
Port Trunking
This switch supports three trunking connections:
Two trunking connections for 10/100Mbps ports
One trunking connection for Gigabit ports.
Trunking connections are manually set by port. The configuration screen lists the ports. The switch treats these
trunking connection ports as one connection. Select one of the trunking numbers, and then select the ports for
the trunking connection.
To use the two Gigabit ports for trunking connection, use
Trunk 29
. Then select
Port 25
and
26
. The
maximum bandwidth is 4Gbps for the Gigabit trunk ports.
1. Select
Port Trunking
from the
Advanced Management
menu.
