Cisco Cisco Packet Data Interworking Function (PDIF)
System Settings
Configuring ASR 5000 Link Aggregation ▀
ASR 5000 System Administration Guide, StarOS Release 18 ▄
85
Preferred Slot
You can define which card is preferred per LAG group as a preferred slot. When a preferred slot is specified, system
behavior varies based on card type:
behavior varies based on card type:
QGLC – the preferred slot is selected when both the top and bottom slots have the same number of active LACP
ports.
XGLC – the preferred slot is selected for the initial timeout period to make the selection of 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.
Distribution Option
The specified distribution option controls how the LAG hash map is generated. This option is set on the master port for
use by the whole LAG via the link-aggregation distribution command. The following table identifies the distribution
options (assuming port index 0,1,2,3 were selected):
use by the whole LAG via the link-aggregation distribution command. The following table identifies the distribution
options (assuming port index 0,1,2,3 were selected):
Table 7. LAG Distribution Options
Distribution
Meaning
Example
Simple
Repetition of all selected port indices
0123012301230123…
Rotate
Repetition of the rotated port indices
0123123023013012…
Block
Blocks of the same port index
0000111122223333
Random
Based on pseudo random number
—