Cisco Cisco Packet Data Gateway (PDG)
System Settings
Configuring ASR 5500 Link Aggregation ▀
ASR 5500 System Administration Guide, StarOS Release 16 ▄
67
Table 4. MIO/UMIO LAG Functionality
ASR 5500
LAGID
Ethernet Switch A
Ethernet Switch B
MIO/UMIO Port 11
1
Port 1
----
MIO/UMIO Port 12
1
Port 2
----
MIO/UMIO Port 13
1
----
Port 1
Multiple Switches with L2 Redundancy
To handle the implementation of LACP without requiring standby ports to pass LACP packets, two separate instances
of LACP are started on redundant cards. The two LACP instances and port link state are monitored to determine
whether to initiate an auto-switch (including automatic L2 port switch).
of LACP are started on redundant cards. The two LACP instances and port link state are monitored to determine
whether to initiate an auto-switch (including automatic L2 port switch).
The figure below shows an LAG established across two MIO/UMIO daughter card ports with L2 redundancy.
Figure 8.
LAG with L2 Redundancy, Two Ethernet Switches
An LACP implementation with L2 redundancy cannot pass traffic even though standby ports have link up. For example,
with two MIO/UMIO cards connected to two different Ethernet switches and all ports in the same LAG, failure of ports
would not trigger a LAG switch until the active port number ratio flipped (more ports down than up).
with two MIO/UMIO cards connected to two different Ethernet switches and all ports in the same LAG, failure of ports
would not trigger a LAG switch until the active port number ratio flipped (more ports down than up).