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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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OSPFv3-BGP Association

OSPFv3-BGP Association

When a new device is deployed on a network or a device is restarted, network traffic may be lost during BGP route convergence because IGP routes converge more quickly than BGP routes. OSPFv3-BGP association can address this problem.

After a device on a BGP network recovers from a fault, BGP convergence is performed again and packet loss may occur during the convergence.

In Figure 7-8, traffic from Device A to Device D through Device C traverses a BGP network.

Figure 7-8 Traffic traversing a BGP network

If Device C fails, traffic is switched to Device B after rerouting. Packets are lost when Device C recovers.

Because OSPFv3 route convergence is faster than BGP route convergence, OSPFv3 convergence is complete whereas BGP route convergence is still going on when Device C recovers. The next hop of the route from Device A to Device D is Device C, which, however, does not know the route to Device D since BGP convergence on Device C is not complete.

Therefore, Device C discards the packets destined for Device D after receiving them from Device A, as shown in Figure 7-9.

Figure 7-9 Packet loss during a device restart without OSPFv3-BGP association

OSPFv3-BGP Association Process

When a device with OSPFv3-BGP association restarts, the device sets the weight to the largest value (65535) in LSAs, instructing other OSPFv3 routers not to use it as a transit router for data forwarding. BGP routes, however, can still reach the device.

Updated: 2019-01-04

Document ID: EDOC1100059473

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