BGP CONFIGURATION ADVERTISEMENT ISSUE

[dissai]

Hello Team,

I have configured bgp with my isp but is not able to see my routes advertising.kindly assist to review my configuration

router bgp 329
bgp log-neighbor-changes
neighbor 41.207.242.133 remote-as 473
neighbor 41.207.242.133 update-source GigabitEthernet0/0/0

!
address-family ipv4
network 102.110.54.0 mask 255.255.254.0
network 102.110.54.0 mask 255.255.255.0
neighbor 41.207.242.133 activate
neighbor 41.207.242.133 next-hop-self
neighbor 41.207.242.133 allowas-in
neighbor 41.207.242.133 soft-reconfiguration inbound
neighbor 41.207.242.133 route-map Orange_PUBLIC_BLOCK_TO_Tango out

exit-address-family
!
ip default-gateway 41.207.242.133
!
!
!

!
ip prefix-list Orange_PUBLIC_BLOCK_TO_Tango seq 5 permit 102.110.54.0/23
ip prefix-list Orange_PUBLIC_BLOCK_TO_Tango seq 10 permit 102.110.54.0/24
!
ip prefix-list Orange_SUPERNET seq 5 permit 102.110.54.0/23

route-map Orange_PUBLIC_BLOCK_TO_Tango permit 30
match ip address prefix-list Orange_DR_PUBLIC_BLOCK
set as-path prepend 329393 329393 329393 329393 329393
!
route-map Orange_PUBLIC_BLOCK_TO_Tango permit 10
match ip address prefix-list Orange_PUBLIC_BLOCK_TO_Tango
!
route-map Orange_PUBLIC_BLOCK_TO_Tango permit 20
match ip address prefix-list Orange_SUPERNET
!

ip prefix-list DEFAULT seq 5 permit 0.0.0.0/0
!
ip prefix-list DEFAULT_ROUTE_ONLY seq 5 permit 0.0.0.0/0
!
ip prefix-list Orange _DR_PUBLIC_BLOCK seq 5 permit 102.110.55.0/24

[MHM Cisco World]

There are many issue but let solve it one by one 

First 

Shwo ip bgp neighbor 

Do you see neighbor or not?

If not 

Then check 

1- the bgp not use defualt route' you need static route to reach neighbor 

2- ip routing enable to add if it disable

3- ebgp multihop must use if the neighbor is not direct connect 

Later after we make sure the neighbor is appear we discuss the route-map I dont get why you add two line and one match /23 and other match /24 of same subnet

MHM

[dissai]

Yes, I can see neighbors and receive routes.

but my routes are not advertised

[MHM Cisco World]

Then first part finish 

Now bgp need you to inject prefix by network or redistrubte 

I dont see these commands?

Note:- route-map out is not inject prefix it only filter it

MHM

[dissai]

I have put but still no advertisment.

router bgp 329393
bgp log-neighbor-changes
neighbor 41.207.242.133 remote-as 37349
neighbor 41.207.242.133 password iQ4ZGewGzrdT0g
neighbor 41.207.242.133 update-source GigabitEthernet0/0/0
!
address-family ipv4
network 102.110.54.0 mask 255.255.254.0
network 102.110.54.0 mask 255.255.255.0
redistribute static route-map Orange_PUBLIC_BLOCK_TO_Tango
neighbor 41.207.242.133 activate
neighbor 41.207.242.133 next-hop-self
neighbor 41.207.242.133 allowas-in
neighbor 41.207.242.133 soft-reconfiguration inbound
neighbor 41.207.242.133 route-map Orange_PUBLIC_BLOCK_TO_Tango out
exit-address-family
INTERNET-EDGE-RT1#
INTERNET-EDGE-RT1#

INTERNET-EDGE-RT1#$p neighbors 41.207.242.133 advertised-routes

Total number of prefixes 0

[MHM Cisco World]

The route-map you use is wrong then it not cover the static route'

Can I see the static route you need to advertise 

The subnet abd mask

MHM

[dissai]

Hi MHM,

Let say I want to advise below.

network 102.220.128.0 mask 255.255.255.0
network 102.220.128.0 mask 255.255.254.0

Kindly assist with correct bgp template to advertise above to seen by my neighbor.

Thank you.

[MHM Cisco World]

Friend there is overlapping in these subnet are you sure both appear in RIB of router ? How one /24 and other /23?

MHM

[dissai]

Let's use this one.

network 102.220.128.0 mask 255.255.254.0

[MHM Cisco World]

Router bgp x

Redistrubte static route-map MHM

!

ip prefix-list MHM seq 5 permit 102.220.128.0/23 

!

Route-map MHM permit 10

Match ip address prefix MHM

Note:- this prefix must be 100% exactly same as prefix appear in RIB otherwise BGP not redistrubte it

MHM

[Harold Ritter]

Hi @dissai ,

The route specified in the network statement first need to be present in routing table to be injected.

Can you provide the output for the following commands:

show ip route 102.220.128.0 255.255.254.0

show bgp ipv4 uni 102.220.128.0 255.255.254.0

Regards,

[dissai]

Hello Brother,

% Network not in table

[MHM Cisco World]

I ask you if you see prefix and you confirm that ? and I send to you 100% same as in RIB ? what in not in table ?
I realy confuse here 
MHM

[Harold Ritter · Accepted solution]

Hi @dissai ,

As I mentioned in my previous post, the route needs to be present in the routing table for the network statement to originate the route in BGP. This could be a static route or a route coming from any routing protocol. A static route to null0 if often uses for aggregate routes, as follow:

ip route 102.220.128.0 255.255.254.0 null0

Regards,

[dissai]

Hi All,
How can I add a blackhole route for my 102.220.18.0/23 prefix on my router
to avoid routing loop