I'm trying to figure out some details regarding BGP GR functionality.
The basic concept is pretty simple, but I cannot find answer to my question:
How BGP peers knows when SSO-performing router switches to standby supervisor?
BGP peers should somehow distinguish real supervisor fail from some other fails.
I think it's very important, because if not so - when 'other fail' occurs BGP peer will keep routes during `Restart Timer` that equal to 120 sec by default. It may cause a blackhole.
Also such a big pause (dead timer + restart timer) is not acceptable for HA infrastructure.
Does really BGP Peers each time when BGP TCP session timed out (no matter why) keeps routes during `Restart Timer`? Or how Restarter notify its peers?
On the other hand - when I simulate termination of the BGP session (add route to the neighbor to Null0 at the Restarter), peer just wait for the holdtime and does not mark routes as stale after. In other words it does not start NSF process. What should happen to start that process in the context of neighbors?
If the BGP session is lost during the RP switchover, the NSF-aware BGP peer marks all the routes associated with the NSF-capable router as stale; however, it continues to use these routes to make forwarding decisions for a set period of time. This functionality means that no packets are lost while the newly active RP is waiting for convergence of the routing information with the BGP peers.
After an RP switchover occurs, the NSF-capable router reestablishes the session with the BGP peer. In establishing the new session, it sends a new graceful restart message that identifies the NSF-capable router as having restarted.
Today I'm going to talk about SD-wan including SD-WAN advanced lab ,, first thing let's take a small brief about the SD_WAN. What is SD-WAN? SD-WAN is Software define wide area network and SD-WAN is key part of the technology o...
Leopold Fisher, Cisco Meraki IoT specialist, will introduce you to new and innovative additions to the Meraki portfolio coming in April 2021.
Meraki Vision Session
MV smart camera range is getting big...
To participate in this event, please use the button to ask your questions
Dynamic Routing Protocols & IPv6
Have any questions on dynamic routing protocols with IPv6?
In this event we will answer all your questions related to dynamic routing pro...
Today I'm going to talk about SD-wan including SD-WAN advanced , first thing let's take a small brief about the SD_WAN.What is SD-WAN? SD-WAN is Software define wide area network and SD-WAN is key part of the technology of software-definednetworking ...
The cat's out of the bag! In October 2020, Cisco announced the Next Generation of Enterprising Routing Platforms: the Catalyst 8000 Edge Platforms Family including the Catalyst 8200, Catalyst 8300, Catalyst 8500, and Catalyst 8000V. The new family of Cats...