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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Do CE Series Switches Support GR and NSR? Do Routing Protocols Flap upon an Active/Standby Switchover?

Do CE Series Switches Support GR and NSR? Do Routing Protocols Flap upon an Active/Standby Switchover?

CE series switches support the non-stop routing (NSR) function. When they perform an active/standby switchover, the routing protocols do not flap.

NSR is enabled on the device by default and does not need to be configured.

Support for graceful restart (GR) of CE series switches varies according to the routing protocols:
  • The Routing Information Protocol (RIP) does not support GR.
  • The Open Shortest Path First (OSPF), Intermediate System to Intermediate System (IS-IS), and Border Gateway Protocol (BGP) do not support the GR restarter function (replaced by NSR), but support the GR helper function.
Table 22-131 Impacts of GR and NSR on the network upon an active/standby switchover
Active/Standby Switchover Without GR or NSR Active/Standby Switchover with GR Active/Standby Switchover with NSR
Neighbor relationships are re-established. Neighbor relationships are re-established. Neighbor relationships are re-established.
Routes are re-calculated. Routes are re-calculated. Routes are re-calculated.
The forwarding table changes. The forwarding table remains unchanged. The forwarding table remains unchanged.
Packets are lost during forwarding and services are interrupted. No packet is lost during forwarding and services are not affected. No packet is lost during forwarding and services are not affected.
The entire network detects route changes and route flapping occurs for a short period of time. Except the neighbors of devices that perform the active/standby switchover, other routers do not detect route changes. The entire network does not detect route changes.
- The GR restarter requires neighbors to support the GR helper function. The GR helper function does not allow multiple neighbors to perform active/standby switchovers in GR mode simultaneously. Neighbors are not required to support NSR.
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Updated: 2020-01-07

Document ID: EDOC1000060766

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