BGP problem address family ipv4

[santox]

Hi I have a Cisco ASR1001 pppoe server with 2 BGP peering to others two routers.

In Cisco I setup bgp+adress family but when my client start pppoe sessions and router assign to them public ips, 1001 dont propagate these ips /32.

If, in

address family ipv4

I had single /32 ip instead of /24 prefix it works. (ex 100.100.100.0/21)

router bgp 666
bgp router-id 10.250.1.1
no bgp enforce-first-as
bgp log-neighbor-changes
neighbor 10.20.1.13 remote-as 666
neighbor 10.20.1.13 description ** IBGP TO ASR1006 VLAN6 **
neighbor 10.20.1.13 update-source TenGigabitEthernet0/0/0.6
neighbor 10.20.1.13 timers 20 60
neighbor 10.20.1.17 remote-as 666
neighbor 10.20.1.17 description ** IBGP TO ASR1006 VLAN5 **
neighbor 10.20.1.17 update-source TenGigabitEthernet0/0/0.5
neighbor 10.20.1.17 timers 20 60
!
address-family ipv4
network 10.250.1.1 mask 255.255.255.255
network 100.100.100.0 mask 255.255.248.0

-------

Can I propagate single ips only if customers go online

so when ip is directly connected to the router?

thank you and good work to all

[santox]

only if I add this command

1001 propagate the customer ip

ex.

customer have assign from pool 100.100.100.1, I must add

address-family ipv4
network 100.100.100.1 mask 255.255.255.255

thank you

[balaji.bandi]

not sure i have not come across this scenario - i do not believe BGP is right choice here i guess for the netmask you looking

as per i know BGP only acccept /24 and more. (i hear some provider can accept /25 and /28 (not saw /32)

[santox]

Hi thanks for reply

is internal BGP not eBGP.

connection with providers is 1006 job.

1001 will use only for pppoe sessions.

thank you and good work

[MHM Cisco World · Accepted solution]

Do yoh try

redistribute connect?

When clients connect it route is add and

redistribute connect 

will advertise it automatic. 

[santox]

hi,

thank you I dont know why I dont use this command first. Always enable in mikrotik routers..

now I add this command and I see all prefixes when pppoe client is active!

thank you and good work!

[Harold Ritter]

Hi @santox ,

The reason it doesn't work with the network statement for the /21 is that you need a route matching that same prefix/prefix length in the routing table. It would probably better to advertise only one block (/21) than to advertise lots of individual routes (/32). To do that you will need to configure a static route for the /21 to null0 as follow:

ip route 100.100.100.0 255.255.248.0 null0

router bgp 666

address-family ipv4 unicast

network 100.100.100.0 mask 255.255.248.0

Regards,

[santox]

Hi Harold

I use command

redistribute connected

and now I have scenario I want.

If /32 is announce to 1001 meaning that client is connect to him and can go to internet via 1006 router.

If not, /24 prefix continue to routing to other network

thank you and good day!