Qglc Link Aggregation; Requirements; Operation - Cisco ASR 5000 Administration Manual

System Settings
You can suppress XGLC SPOF alarms if port redundancy is handled at Layer 2 via LAG.
You enable or disable XGLC SPOF alarms via the Global Configuration mode enforce spof CLI command.
configure
[ no ] enforce spof suppress-xglc-lag
Notes:
• enforce spof suppress-xglc-lag disables XGLC SPOF alarms if redundancy is configured via LAG.
• no enforce spof suppress-xglc-lag enables XGLC SPOF alarms if they have been previously suppressed.
Important

QGLC Link Aggregation

The aggregated ports must be on the same QGLC redundant pair. Link aggregation does not work across line
card slots. In the event of a failure of one or more of the member physical ports, the remaining ports continue
to be aggregated. Top and bottom QGLCs can be connected to different switches in a LAG.

Requirements

Observe the following requirements:
• Assure that links between the two systems are full duplex and at the same speed.
• Set the port medium configuration to auto or full duplex and maximum speed.
• An aggregation group can consist of from one to four ports. A port can only be in one aggregation group;
• Certain physical port configuration changes, such as the MAC address or Service Redundancy Protocol
There is additional information on configuring ports and port redundancy in Configuring Line Card and SPIO
Port Redundancy.

Operation

Link aggregation operates as a sublayer between the MAC client and the MAC layer.
With SPOF alarming suppressed, a port in a LAG group will trigger a SPOF alarm if it is the only available
distributing port in the LAG group.
for example, Port 3 can be in Group A linked to Switch 1, but it cannot simultaneously be in Group B
linked to Switch 2.
(SRP), are prohibited on any interface participating in link aggregation
ASR 5000 System Administration Guide, StarOS Release 21.1
QGLC Link Aggregation
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