Specifications

8-26 Rapier Switch Software Reference
Software Release 2.7.3
C613-03098-00 REV A
VLAN relaying operates in the following stages:
1. The user creates one or more VLAN relay entities and adds the required
VLANs and protocols to each entity.
2. The VLAN relay entity attaches to each specified VLAN and receives traffic.
If more than one VLAN relay entity is attached to the same VLAN for the
same protocol type, an intermediate attachment level receives the packet,
duplicates it, and sends it to separate VLAN relay entities as required.
3. The VLAN relay entity sends the packet to the appropriate destination
VLAN. Destination addresses are determined from the switch’s learned
address tables. If the destination address cannot be found, the packet is sent
to all ports on all VLANs that are part of the VLAN relay entity. If the packet
is destined for the VLAN on which it was received, the relaying entity does
not send it to that VLAN because the packet causes a destination lookup
failure, and the switch itself sends the packet to all ports in the VLAN.
Configuring VLAN Relaying
To configure VLAN relaying on the switch, first create a VLAN relay entity and
give it a unique name, using the command:
create vlanrelay=name
An existing VLAN relay entity can be disabled or destroyed using the
commands:
disable vlanrelay=name
destroy vlanrelay=name
In many networks, only one VLAN relay entity is required. The following
configurations are examples of situations when more than one VLAN relay
entity is used.
• If a number of protocols and VLANs are part of VLAN relaying but not
all protocols on all VLANs, then setting up a number of VLAN relay
entities allows only relevant protocols and VLANs to be part of
relaying.
• If traffic is to be relayed between certain VLANs but not others (for
example, between VLAN 1 and VLAN 2, and between VLAN 1 and
VLAN 3, but not between VLAN 2 and VLAN 3), then separate VLAN
relay entities are required.
To initiate relaying, add the VLANs which packets are to be sent between, and
the desired protocols, to the VLAN relay entity, by using the command:
add vlanrelay=name [protocol=protocoltype] [vlan={vlan-name|
1..4094}]
IBM SNA 80D5 EthII
SNMP 814C EthII
AllSNAP all SNAP protocols SNAP
Table 8-5: Predefined protocol types implemented by VLAN relay (Continued)
Protocol Name Protocol Number Encapsulation