DITECH Packet Voice Processor, Руководство по управлению

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Media Provisioning
Packet Voice Processor Commands Manual
6.5 LAG Failover
Scenarios The following events cause either traffic redirection and/or port state transition in a
Packet Voice Processor LAG:
Port Failures
Next-Hop IP Failures
6.5.1 Port Failures - Port State Transition / Traffic Redirection
Figure 6-5 on page 73 displays how a Packet Voice Processor system with various
different port provisionings react to port failure events. Each box in this figure
represents the provisioned settings for 4 Gigabit Ethernet interfaces on the 2
Interface Processing cards located in shelf slots 4 and 6 (see Figure 1-3 on page 4 ).
Each port has either an active, inactive, or standby state. Each port also has either a
master or backup redundancy role.
The solid lines in Figure 6-5 represent the redirection flow in the event of a port
failure. The dashed lines in Figure 6-5 represent state transition only (no redirection
flow, i.e. active port remains up). For example, at the reader’s left in this diagram (see
location A in the figure), the 4 Gigabit Ethernet ports are provisioned as follows:
GigE/4/1 Active Master
GigE/4/2 Standby Backup
GigE/6/1 Active Master
GigE/6/2 Standby Backup
In the event that the GigE/6/1 port fails, traffic is redirected to GigE/4/1 port. GigE/6/1
port state becomes inactive (follow the solid line from location A to location B). The
4 Gigabit Ethernet ports are now provisioned as follows:
GigE/4/1 Active Master
GigE/4/2 Standby Backup
GigE/6/1 Inactive Master
GigE/6/2 Standby Backup
If GigE/4/1 port subsequently fails, then GigE/4/1 port becomes inactive (follow the
solid line from location B to location C). Additionally, both GigE/4/2 port and GigE/6/2
port then become active. Finally, if the GigE/6/2 port fails, then traffic is redirected to
the GigE/4/2 port (follow solid line from location C to location D).
Use Figure 6-5 to determine LAG port state transitions and traffic redirections when
an active port fails (solid lines). Use Figure 6-5 to also determine the state transitions
for a standby port, when that port is up or down (dashed lines). Note that when a
standby port goes up or down, it does not affect media traffic running on the active
LAG ports.