System Management
208
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Figure 10 MC-LAG at Access and Aggregation Sites
ICB (Inter-Chassis Backup) spoke SDPs are supported for use with Epipe services
in an MC-LAG configuration. ICB spoke SDPs provide resiliency by reducing packet
loss when an active endpoint is switched from a failed node of an MC-LAG group to
a standby node. For example, if a port on an active MC-LAG node fails, the port on
one of the peers becomes active, but traffic continues to route to the previously active
MC-LAG node until it detects the failure. ICB spoke SDPs ensure that in-flight
packets are delivered to the newly active MC-LAG node. Two ICB spoke SDPs must
be created. The ICB associated with the MC-LAG on the first node must be
associated with the pseudowire on the second node. Likewise, the ICB associated
with the MC-LAG on the second node must be associated with the pseudowire on
the first node.
Enabling the LAG slave-to-partner parameter ensures synchronized activity
switching between the multi-chassis and the single-chassis endpoints. When multi-
chassis endpoints are configured in slave-to-partner mode, multi-chassis endpoints
always follow the single-chassis activity. The link that is promoted as active via the
single-chassis endpoint is used as the active link. Enabling slave-to-partner ensures
that out-of-sync scenarios do not occur for the LAG. A multi-chassis pair with
pseudowire redundancy and ICBs is always able to direct traffic to the active
endpoint, so enabling slave-to-partner does not impose any risk on the network side.
23425
MC-LAG
MC-LAG
Radio
Controller
Optional ICB Spoke SDP
Redundant PWs
Legend:
BTS/
NodeB
7705 SAR-18
7705 SAR-18
7705 SAR-8/-M
7705 SAR-8/-M
SAP
Note: A 7705 SAR node in an MC-LAG configuration that has an ICB spoke SDP configured
on it with the MC-LAG in standby mode does not terminate Ethernet CFM frames. It
transparently switches the frames to the other node of the MC-LAG group. This mode of
operation is consistent with the 7705 SAR operating in S-PE mode.
To Next Page
Loading...
