Do CE series switches support the GR and NSR functions

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CE series switches support the non-stop routing (NSR) function. When they perform an active/standby switchover, routing protocols do not flap.
Support for graceful restart (GR) of CE series switches varies according to the routing protocols:
- RIP does not support GR.
- OSPF, IS-IS, and BGP do not support the GR restarter function (NSR is used instead), but support the GR helper function.

Other related questions:
Do CE series switches support the FC function
CE series switches support the FC function in V100R005C10 and later versions. Currently, only the CE6850U-HI supports the FC function.

Do VSs on CE series switches support multicast functions
Among all VSs in port mode, only the admin-VS supports multicast functions. All VSs in group mode support multicast functions.

How do S series switches implement unplanned OSPF GR and planned OSPF GR
In unplanned GR mode, a device directly performs a active/standby switchover without sending a grace LSA to its peer. As a result, the peer does not enter the Helper state. After the standby card switches to the active card and goes Up, the device sends a grace LSA. Therefore, the smooth time cannot exceed the dead interval. The timer in graceful period timer of IETF GR needs to be negotiated based on the timer value configured on the Restarter. The default timer value is 120s.

What multicast features do CE series switches support
The right figure shows the multicast features supported by CE series switches.

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