BGP Global RIB vs Adj-RIB-Out

[hfakoor222]

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Now in the snippet below step 5 mentions "Install the best-path route into the global RIB, process outbound rules... then advertise to BGP peers"

My question is this statement referring to the best route being advertised from the global-RIB or the routes in the Adj-OUT table being advertised? I'm assuming it is the global RIB.

[MHM Cisco World · Accepted solution]

this my note for Loc-RIB and Adj-RIB-Out.

[MHM Cisco World]

.

[hfakoor222]

I read 3 pages further, it states the Sdj-RIB-Oyt table routes are being advertised. I guess this is done so the neighbor router knows of other poterntial routes.

[MHM Cisco World]

see my comment above for your Q.

[paul.driver]

Hello

Yes it is the global route table (GRT)

[paul driver]

Hello

Yes it is the global route table (GRT)

[MHM Cisco World · Accepted solution]

First Thanks to @paul.driver  for his comment.
and @hfakoor222 to be 100 % sure that happened I do small LAB 
R1-R4-R2 AS 100
R2-R3  AS 200
LO 1.1.1.1 in both R1 and R4

show ip bgp route <- receive the LO route from R1 

show ip bgp route<- receive the LO route from R4

show ip route global

apply

route-map OUT 

match permit only LO route that next-hop is R4

NOW when apply

 route-map OUT

and check

show ip route 

R3 advertised-route 
I see that there is NO route and that make sense since 

Global RIB contain only best path. 
best path is point to R1 not R4 
I apply

route-map OUT

to filter 
the LO route is missing 
because

route-map OUT

apply to global RIB not Local-RIB receive from R1/R4 i.e. after best path select not before that.
and hence the Adj-RIB-out is show "0" route.

so I hope this lab is answer your Q.