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No one fixed the cables, they have rerouted traffic through other links. Most of the traffic was automatically rerouted, that's how BGP works.
by lossolo 7y ago
No one fixed the cables, they have rerouted traffic through other links. Most of the traffic was automatically rerouted, that's how BGP works.
- walrus01 7y agoIf it took 30 minutes that's not BGP, that's some people at ISPs manually provisioning new circuits on DWDM systems, using a moderate amount of automation tools, and bringing the circuits up facing routers at both ends. Or doing something like creating a few new VLANs in existing larger 100/200/400Gbps intercity transport links, and trunking those VLANs through to routers on each end. A topology change in BGP is a couple of seconds.
- lossolo 7y agoThat's why I've specifically wrote "most", of course it's not all BGP, BGP routing algorithms do not need 30 minutes to change routes.
- iso947 7y agoDo international peers tend to use BFD?
- oogali 7y agoBGP may or may not still be involved. BGP itself has no real facility for dealing with circuit congestion. So, I am willing to bet that dynamic routing was certainly in place, but the secondary/eBGP multipath destinations were full when the primary path went down. And that necessitates manual action in instances where you aren't doing MPLS-TE, or don't have enough standby capacity, or both.
- walrus01 7y agoKeeping sufficient hot standby submarine capacity live and in contract is very costly in $/month.