I've been a member on the forums for many years but not super active. One of the reasons is that there doesn't appear to be many ongoing discussions or active conversations in the forums recently.
In the interest of maybe changing that, I'm starting this particular thread. I'll start it off with my background and what I'm currently working on. Maybe this will lead to other discussions or topics but, at the very least, I'll find out who is active and interested in discussion
I've been working in networking for more than 15 years. I passed CCNA over 12 years ago (R&S) and progressed towards CCNP but then got involved in a group where that wasn't necessary for my day to day. Long story short, my cert lapsed but, I have continued to work in networking in various capacities since.
I'm currently just started working seriously on getting the R&S CCIE. I've decided to skip CCNA/CCNP as I've got fairly extensive experience and have worked day to day in managing, designing and supporting several datacenters around the globe for a service provider (VoIP and Collab svcs).
I'm just starting on the studying journey and there a ton of gaps in my knowledge that I need to fill on technologies that I don't use daily but, I think my basics are pretty solid and it makes more sense for me personally to pursue the cert I'm interested in. I'll probably take the CCNA/CCNP exams at some point during my study but, that's not my focus.
Hopefully, others on this forum will chime in on what they are currently working on an a little something about themselves. Hope to meet/get to know others in the community. Looking forward to hearing from others about their current positions, goals and activities.
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it's may be a good practice to clear the routing table to speed up the BGP table Convergence process, but how ?
well there are plenty of options,
1) Hard clear of the neighbor :
- clear ip bgp <A.B.C.D> (ex, R1#clear ip bgp 18.104.22.168 )
- clear ip bgp * (* = all neighbors and not just one.)
this option clears the BGP neighbor relationship (removes the neighboring relationship then negotiate it again. )
this option may be Okay for the exam environment , but this may never be the best solution the real environment , why not ??
well , because the BGP internet table might be a 100's of thousands of Paths (IP addresses) , so if you hard clear the neighbors , you will lose all your routes and neighboring relationship, and will have to wait for BGP to renegotiate the neighboring relationship.
2) soft Clear :
- clear ip bgp * in (clears only inbound updates, asking the neighbor to send updates again)*
- clear ip bgp * out (clears it's outbound updates, sending the neighbor newer updates )
- clear ip bgp <A.B.C.D> soft (this command clears both inbound and outbound updates)
- clear ip bgp <A.B.C.D> soft in (clears only inbound updates, asking the neighbor to send updates again)*
clear ip bgp <A.B.C.D> soft out (clears it's outbound updates, sending the neighbor newer updates )*
soft clear is basically a clearing of the routing table either inbound or outbound (performing what is called a "Route Refresh"), requesting newer updates from the neighboring BGP table (when used inbound) or sending newer updates from our Local BGP table to our neighbors (when used outbound)
Note: there's nothing special about the outbound behavior other than what i explained
Inbound Behavior explained in depth :
(the previous description of soft reconfiguration is the default behavior when the "soft-reconfiguration inbound" feature is NOT activated)
When soft-reconfiguration inbound is activated :
when this option(or feature) is activated, the router will create a backup of the routes received from his neighbor(s) before applying any filters or features to those routes. (let's call this backup table the "SOFT TABLE")
so when you initiate a soft clear to the neighbor(s) (as shown in the commands above) then the router initiating the command will do the following steps
- check the if there are any filters or route-maps toward that neighbor.
- instead of sending a request of a refresh(asking the neighbor for updates
again,hence Route-Refresh), the route will instead only use his "SOFT TABLE" and
apply those filters(from step one, if existed) to the routes in the "SOFT TABLE"
now the million dollar Question : HOW DO I ACTIVATE soft-reconfiguration inbound ?
simple, here's how
neighbor <A.B.C.D> soft-reconfiguration inbound
although there are more clear options for the BGP protocol, i have only describe the protocols relevant to the CCNP Blueprint, or CCIE for IPv4 Address-family.