Cisco Cisco Packet Data Gateway (PDG)
System Settings
▀ Configuring ASR 5000 Link Aggregation
▄ ASR 5000 System Administration Guide, StarOS Release 16
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Use the following command to add a port as a member of the link aggregation group number
N
only if the master port is
assigned. Otherwise, it is added to the group when the master port is assigned:
port ethernet <slot#/port#>
link-aggregation member group <N>
exit
Important:
The VPN can only bind the master port, and a VLAN can only be created on the master port. A
failure message is returned if you attempt to bind to a link aggregation member port.
Two redundant line cards and their controlling packet services card function as a system; this allows loopback
addressing between vertical slots. Each system that participates in link aggregation has a unique system ID that consists
of a two-byte priority (where the lowest number [0] has the highest priority) and a six-byte MAC address derived from
the first port’s MAC address.
addressing between vertical slots. Each system that participates in link aggregation has a unique system ID that consists
of a two-byte priority (where the lowest number [0] has the highest priority) and a six-byte MAC address derived from
the first port’s MAC address.
The following command sets the system priority used to form the system ID.
P
can be one of the following options:
a hexadecimal number in the range [0x0000..0xFFFF, default = 0x8000]
an integer from 0 through 65535
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.