Restrictions - Cisco ASR 900 Series Configuration Manual
Time division multiplexing configuration; cisco ios xe fuji 16.7.x
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Also See for ASR 900 Series:
- Release notes (310 pages) ,
- Manual (174 pages) ,
- Configuration manual (172 pages)
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Restrictions
PEs are connected to a Base Station Controller (BSC). APS state of the router is communicated to the Layer2
VPN, and is therby coupled with the pseudowire status .
Figure 4: Pseudowire Redundancy with MR-APS
BSC monitors the status of the incoming signal from the working and protect routers. In the event of a swithover
at the BSC, the BSC fails to inform the PE routers, hence causing traffic drops.
With pseudowire redundancy Active-Active configuration, the traffic from the upstream is replicated and
transmitted over both the primary and backup pseudowires. PE routers forwards the received traffic to the
working and protect circuits. The BSC receives the same traffic on both the circuits and selects the better Rx
link, ensuring the traffic is not dropped.
Figure 5: Pseudowire Redundancy with Uni-directional Active-Active
Note
If teh ASR 900 router is configured with the aps l2vpn-state detach command but, the ASR 901 router
is not enabled with redundancy all-active replicate command, the protect PW is active after APS
switchover. On the ASR 901 router, the PW state is UP and the data path status displays standby towards
protect node. On an APS switchover on the ASR 900 router, the status is not communicated to ASR 901
router, and the VC data path state towards the protect node remains in the standby state.
Restrictions
The following restrictions apply on the router:
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
42
Configuring Pseudowire
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