Cisco Cisco Packet Data Gateway (PDG) Guida Dell'Amministratore
System Settings
▀ Configuring ASR 5000 Link Aggregation
▄ Cisco ASR 5000 System Administration Guide
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auto
card slot#
link-aggregation system-priority P
Ports in a system are assigned keys. The group number maps directly to the key, whereupon only ports with the same
key can be aggregated. Ports on each side of the link use a different aggregation key.
key can be aggregated. Ports on each side of the link use a different aggregation key.
The system ID, port key and port ID of two peers form the Link Aggregation Group Identifier (LAGID). You can
aggregate links having the same LAGID. Systems are often configured initially with each port in its own aggregation
(requiring a separate key per port), or with all ports in the same aggregation (a single key for all ports). Negotiation via
LACP would qualify the actual aggregation.
aggregate links having the same LAGID. Systems are often configured initially with each port in its own aggregation
(requiring a separate key per port), or with all ports in the same aggregation (a single key for all ports). Negotiation via
LACP would qualify the actual aggregation.
Systems exchange information about system ID, port key and port ID with peers across the physical links using LACP.
LACP packets are defined with the Slow Protocol format. Each system sends out its own (“actor”) information and its
last received information about its peer (“partner”) over the physical link.
last received information about its peer (“partner”) over the physical link.
Use the following commands to set the LACP parameters. LACP can run in active mode to send LACP packets
periodically, or in passive mode, in which it only responds to LACP packets it receives.
periodically, or in passive mode, in which it only responds to LACP packets it receives.
LACP can send packets at either a slow (30s) or fast (1s) rate. The defaults for this release are Active and Slow; see the
sample configuration below:
sample configuration below:
config
port ethernet slot#/port#
link-aggregation lacp { active | passive } [ rate { auto | fast | slow } |
timeout { long | short } ]
timeout { long | short } ]
Peers send out LACP packets when the state changes or if a difference is found from a received LACP packet about its
own state.
own state.
Corresponding ports on a QGLC or XGLC redundant pair cannot be active at the same time. Redundant ports share the
same MAC address, so after a failover is resolved, the original port rejoins the LAG.
same MAC address, so after a failover is resolved, the original port rejoins the LAG.
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
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 } ]
slot { card_number | none } ]