Unsuppress Map

[ajkelsey78]

I have two routers, R6 and R7. I aggregated routes to R6 and used a suppress map to stop 172.20.1.0 and 172.20.4.0 from being advertised. It worked. I then configured an unsuppress map to advertise those two routes to R6. However, it has been unsuccessful. (this is a learning exercise)

[MHM Cisco World]

MHM 

[ajkelsey78]

Summary-only did not solve the issue. The unsurpress map still isn't passing the routes to R6.

[MHM Cisco World]

did you clear ip  bgp ?

you need to clear ip bgp to make config take effect 
then check in R6 172.20.1.0 and 172.20.4.0

MHM

[ajkelsey78]

I did. Also, the routes being advertised to change.

Before:

After:

[MHM Cisco World]

I run lab and it work perfect 
can I see last code you use 

[ajkelsey78]

Try my config files.

[MHM Cisco World]

What last code you use' share it here 

The config in your original post dont include summary only and I done sure what else change.

MHM

[paul driver]

Hello @ajkelsey78 
Try stating a prefix specific of the the summary and not a default route to unsuppress

[ajkelsey78]

I tried using 172.20.0.0/21 with no luck.

[paul driver]

Hello

---

@ajkelsey78 wrote:
I tried using 172.20.0.0/21 with no luck.

---

If you wish to initially suppress/unsuppress certain routes to ALL peers at the same time then you use the suppress-map

Example1:
route-map Suppress-Map deny 10  <--- all routes specified in the deny RM WILL NOT be suppressed
match ip address Suppress-1-4  

route-map Suppress-Map permit 100

or

route-map Suppress-Map permit 10  <--- all routes specified in the permit RM WILL be suppressed
match ip address Suppress-1-4  

aggregate-address 172.20.0.0 255.255.248.0 suppress-map Suppress-Map

Example2:
If you wish to initially suppress certain routes to ALL peers at the same time and then unsuppress to a particular peer then you use a unsuppress map

route-map Suppress-Map permit 10  <--- all routes specified in the permit RM WILL be suppressed
match ip address Suppress-1-4  

ip access-list standard ALLOW-ALL-TO-R6
permit 172.20.1.0 0.0.0.255

route-map Unsuppress-Map 
match ip address ALLOW-ALL-TO-R6

aggregate-address 172.20.0.0 255.255.248.0 suppress-map Suppress-Map
neighbor <r6> unsuppress-map Unsuppress-Map 

Example3:
If you wish to initially suppress ALL routes to ALL peers at the same time and then unsuppress to a particular peer then you can use the summary only command without any suppress-map then utilise an unsuppress-map for particular peers to advertise specific routes along with the summary route

ip access-list standard ALLOW-ALL-TO-R6
permit 172.20.1.0 0.0.0.255

route-map Unsuppress-Map 
match ip address ALLOW-ALL-TO-R6

aggregate-address 172.20.0.0 255.255.248.0 summary-only
neighbor <r6> unsuppress-map Unsuppress-Map

[MHM Cisco World]

apologize but Ex2 is same as Ex3 

you use aggregate with suppress ALL which is same as aggregate with summary-only 

MHM

[paul driver]

Hello @MHM Cisco World 
not so sure I understand..

Example2 =  certain specfic routes not ALL specific routes are being suppressed based on the OPs already assigned route-map and acl

Example3 = ALL specific routes are being suppressed using the summary-only command and then a unsuppress map is used again based on the OP already assigned route-map and acl

[MHM Cisco World]

Suppress-1-4  <<- Maybe I get this wrong' I was think this include all prefix. 

MHM

[paul driver]

ip access-list standard Suppress-1-4
 permit 172.20.1.0 0.0.0.255
 permit 172.20.4.0 0.0.0.255