Redundancy Options; Distribution Option; Toggle Link; Horizontal Link Aggregation With Two Ethernet Switches - Cisco ASR 5000 Administration Manual

Horizontal Link Aggregation with Two Ethernet Switches

Redundancy Options

For redundancy, there is an option that controls the auto-switching of L2 redundant or active-active ports
when they are connected to two switches. Set this option on the master port for use with the whole group.
link-aggregation redundancy { standard | switched } [hold-time sec] [ preferred slot { card_number |
none } ]

Distribution Option

This option controls how a LAG hash map is generated and is required for Equal Cost Multiple Path (ECMP)
over LAG. Set this option on the master port for use with the whole group.
link-aggregation distribution { simple | rotate | block | random }
The following list defines the distribution options (assuming port index 0,1,2,3 were selected.
• simple: Repetition of all selected port indexes (Example: 0123012301230123...)
• rotate: Repetition of rotated port index (Example: 0123123023013012...)
• block: Blocks of the same port index (Example: 0000111122223333)
• random: Based on pseudo random number

Toggle Link

A port or card switch within the LAG can be set to toggle the link. Enable this option via the link-aggregation
toggle-link command at the Card Configuration Mode or Ethernet Port Configuration Mode.
Horizontal Link Aggregation with Two Ethernet Switches
When a LAG contains two sets of ports each connecting to a different Ethernet switch, the operator has the
ability to specify the slot/port (connected to the destination switch) when switching ports.
The Exec mode link-aggregation port switch to slot/port command is used to configure this option. The
following criteria apply to the setting of this option:
• slot/port must support LAG.
• slot/port must be configured with LAG.
• slot/port must not be already actively distributing.
• slot/port must have negotiated a link aggregation partner in standard mode.
• slot/port's partner must have an equal or higher in standard mode.
• slot/port's partner bundle must have equal or higher bandwidth in standard mode.
• Switching to slot/port must not violate preference within hold-time in standard mode.
ASR 5000 System Administration Guide, StarOS Release 21.1
78
System Settings