Limitation of BNG-SRG state control routes

[Serg_tsk]

Dear colleagues, I have new question about Subscriber redundancy group.

ASR 9006, RSP440-SE, iOS-XR Version 6.4.2, 32-bit.

What is the maximum number of entries in state-control-route directive I can use ? I read this topic:

"A maximum of 30 state control routes can be added in each subscriber redundancy group (SRG), with a limit of 10 state control routes for each route type. That is, user can have a maximum 10 IPv4 routes, 10 IANA routes and 10 IAPD routes in each SRG. In these 30 routes, user can have routes in either the default or the non-default VRF"

But i have more that 30 entries in my running-config and that is OK: SRG works normally.

subscriber
 redundancy
  group 24
   preferred-role master
   virtual-mac 10f3.1117.0024
   slave-mode hot
   hold-timer 5
   peer 172.24.63.2
   peer route-disable
   access-tracking srg_cluster24
   state-control-route ipv4 10.211.4.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.5.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.6.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.4.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.5.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.6.0/24 vrf cust tag 1
   state-control-route ipv4 10.103.70.0/24 vrf cust tag 1
   state-control-route ipv4 10.185.69.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.20.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.26.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.27.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.75.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.91.0/24 vrf cust tag 1
   state-control-route ipv4 10.243.99.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.20.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.26.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.27.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.75.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.91.0/24 vrf cust tag 1
   state-control-route ipv4 172.17.99.0/24 vrf cust tag 1
   state-control-route ipv4 10.115.115.0/24 vrf cust tag 1
   state-control-route ipv4 10.117.189.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.131.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.137.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.139.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.141.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.142.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.143.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.145.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.146.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.147.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.151.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.158.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.162.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.167.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.168.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.169.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.170.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.171.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.176.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.184.0/24 vrf cust tag 1
   state-control-route ipv4 10.161.189.0/24 vrf cust tag 1
   state-control-route ipv4 10.174.196.0/24 vrf cust tag 1
   state-control-route ipv4 10.174.207.0/24 vrf cust tag 1
   state-control-route ipv4 10.211.126.0/24 vrf cust tag 1
   state-control-route ipv4 10.227.196.0/24 vrf cust tag 1
   state-control-route ipv4 10.227.203.0/24 vrf cust tag 1
   state-control-route ipv4 10.227.207.0/24 vrf cust tag 1
   state-control-route ipv4 10.227.219.0/24 vrf cust tag 1
   state-control-route ipv4 10.227.244.0/24 vrf cust tag 1
   state-control-route ipv4 10.243.100.0/24 vrf cust tag 1
   state-control-route ipv4 10.243.120.0/24 vrf cust tag 1
   state-control-route ipv4 10.243.124.0/24 vrf cust tag 1
   state-control-route ipv4 10.245.170.0/24 vrf cust tag 1
   state-control-route ipv4 172.19.69.0/24 vrf cust tag 1
   state-control-route ipv4 172.19.70.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.115.0/24 vrf cust tag 1
   state-control-route ipv4 172.16.126.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.131.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.137.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.139.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.141.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.142.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.143.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.145.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.146.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.147.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.151.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.158.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.162.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.167.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.168.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.169.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.170.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.171.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.176.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.184.0/24 vrf cust tag 1
   state-control-route ipv4 172.18.189.0/24 vrf cust tag 1
   state-control-route ipv4 172.20.170.0/24 vrf cust tag 1
   state-control-route ipv4 172.21.189.0/24 vrf cust tag 1
   state-control-route ipv4 172.17.100.0/24 vrf cust tag 1
   state-control-route ipv4 172.17.120.0/24 vrf cust tag 1
   state-control-route ipv4 172.17.124.0/24 vrf cust tag 1
   state-control-route ipv4 172.23.196.0/24 vrf cust tag 1
   state-control-route ipv4 172.23.207.0/24 vrf cust tag 1
   state-control-route ipv4 172.22.196.0/24 vrf cust tag 1
   state-control-route ipv4 172.22.203.0/24 vrf cust tag 1
   state-control-route ipv4 172.22.207.0/24 vrf cust tag 1
   state-control-route ipv4 172.22.219.0/24 vrf cust tag 1
   state-control-route ipv4 172.22.244.0/24 vrf cust tag 1
   revertive-timer 7 maximum 9
   interface-list
    interface Bundle-Ether24.0 id 240
    interface Bundle-Ether24.1 id 241
   !
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Thank you!

With best regards, Sergey.

[xthuijs · Accepted solution]

hi sergey, it is more a testing limit,

I see your ranges are quite disjoint and not easy to summarize, but if they can be summarized, I would recommend to do so.

alternatively, you can use the null route option with object tracking enabled on them to redistribute these static routes, it is a bit less user friendly since you need the rpl to exclude other possible static routes you may not want to redistribute, where as the subscrbier state control route give you a natural tracked semi static route of the subscriber kind with a tag that is easier to trap through RPL without much extra config of prefix lists etc.

xander

[Serg_tsk]

Thank you ,Xander. I'll use non-summarized routes until we migrate to S-C-tag subscriber termination and /32 mask per subscriber.

With best regards

Sergey.