Rapid Port Shutdown (Rps); Vlan Tagging - Trango Systems TrangoLINK GigaPlus User Manual

2. User commands: When the operator changes the following settings on the
active unit, an unintentional failover may occur. It is not recommended to run
any of these commands while an active 1+1 link is running:
a. acm enable
b. bootimage upgrade odu
c.
d. data pattern
e. loopback
f. opmode
g. odupower
h. power
i. reboot
j. speed

Rapid Port Shutdown (RPS)

GigaPlus supports the shutdown of the Ethernet ports to assist in rerouting traffic in the
event of a link failure. When enabled at both ends of the link, All Ethernet ports at both
ends of the active link will be shut down within 50 mS of the modem lock status
changing from "1" to "0" at either end of the link.
RPS emulates a cable failure if the entire link is thought of as a cable, and will trigger a
routing change when used with a switch or router setup for Rapid Spanning Tree
Protocol (RSTP) or another layer 2 routing protocol at both ends, as is normal in a ring
architecture. For higher layer routing protocols the ports are normally left active in the
event of a link loss.
It is highly recommended that the operator enable ACM when using RPS since the
fade margin will be much higher than a non-ACM speed setting, preventing link loss
and subsequent rerouting during weather related events.

VLAN Tagging

GigaPlus supports tagged packets with VLAN IDs ranging from 0-4089. The last seven
VLAN IDs are used internally as described in the Port Mapping Section below. If In Band
Management (IBM) is used, the management traffic can be configured to have a VLAN
tag to allow the switch internal to the system to identify packets in the data stream and
direct them to the CPU for processing. The VLAN ID for management is user specified
using the ibm command, with a factory default VLAN ID of 4085. It is recommended that
the management traffic be tagged with the highest priority setting to ensure that in the
event of network traffic saturation, the management traffic will have precedence (See
Quality of Service Section). Untagged IBM is also supported in Firmware release 3.0 and
Trango Systems, Inc.
datapath
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