Rstp And Switch Redundancy Configuration - Avaya G430 Manual

A spanning tree protocol blocks one of the links from Branch Gateway to the external LAN
switch. The spanning tree protocol must be configured on the external LAN switch and the
Ethernet LAN ports on Branch Gateway. For information about configuring spanning tree on
the Ethernet LAN ports, see
When Branch Gateway senses that the link is out of service on the active port, it automatically
enables the second link. Both the ports must be administratively enabled on the LAN switch
peer.
Fast RSTP is advantageous in comparison with port redundancy because it controls the link
state according to the best LAN topology using the link's cost. However, it incurs a RSTP
convergence time penalty.
Figure 4: RSTP LAN deployment

RSTP and switch redundancy configuration

The Branch Gateway can be deployed in the LAN using RSTP and switch redundancy to
provide redundancy. The Branch Gateway is connected to two external LAN switches. Each
of the Ethernet LAN ports located on the Branch Gateway's front panel is connected to one of
the switches.
Spanning tree protocol blocks one of the links from the Gateway to the external LAN switch.
Spanning tree protocol must be configured on both the external LAN switch and the Ethernet
LAN ports on the Branch Gateway. For information on configuring spanning tree on the
Ethernet LAN ports, refer to
When the Branch Gateway senses a link down failure on the active port or failure of the switch
to which the active link is attached, it automatically enables the blocked link to the backup
switch. Both ports need to be administratively enabled on the LAN switch peer.
The advantage of fast RSTP over port redundancy is that it controls the link state based on
the best LAN topology using the links' cost. However, an RSTP convergence time penalty is
incurred.
Administering Avaya G430 Branch Gateway
Spanning tree on page 338.
Spanning tree on page 338.
Supported LAN deployments
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