Cisco Cisco Packet Data Gateway (PDG)
System Settings
Configuring ASR 5500 Link Aggregation ▀
ASR 5500 System Administration Guide, StarOS Release 18 ▄
77
Table 6. Auto-Switch Port States
State
Counter
Description
Link
L(x)
Physical link up
Standby
S(x)
Link up but in standby mode
Waiting
W(x)
Waiting for Link Aggregation Control Protocol negotiation
Aggregated
A(x)
Aggregation formed
Hold Time
Once the LAG manager switches to another LACP instance, it does not consider another change for a short period to let
link and LACP negotiation settle down. This “hold time” is configurable.
link and LACP negotiation settle down. This “hold time” is configurable.
The LAG manager also enters/extends the hold period when an administrator manually switches ports to trigger a card
switch.
switch.
Preferred Slot
You can define which card is preferred per LAG group as a preferred slot. When a preferred MIO/UMIO slot is
specified, it is selected for the initial timeout period to make the selection of a switch less random.
specified, it is selected for the initial timeout period to make the selection of a switch less random.
Port preference is not allowed in this mode.
Auto-Switch Criteria
The following criteria determine the switching of card x to card y to provide better bandwidth while allowing manual
intervention. The evaluation of the criteria occurs outside of the hold period.
intervention. The evaluation of the criteria occurs outside of the hold period.
Ports are automatically switched from card x to card y when A(y) = 1, at least one port is in aggregated state on card y,
and one of the following conditions is true (in order of precedence):
and one of the following conditions is true (in order of precedence):
L(x) L(y) Less ports with link Up on card x than card y
S(x) S(y) More ports in Standby state on card x than card y
W(x) W(y) More ports in Waiting state on card x than card y
A(x) A(y) Fewer ports in Aggregated state on card x than card y
Card y is preferred
Card y is selected.