We are currently testing a dual-stack setup on our BNG. IPv4 only is already productively running (XR 6.4.2).
The BNG plays DHCP server for both protocols, an external radius server assigns the attributes (ip, mask, vrf, interface for ipv4, delegated-prefix, ipaddrv6 for ipv6). All this seems to be fine, a session is created, the routing table gets populated and the CPE get his ipv4/ipv6 add with a prefix /62 subnet.
While the connectivity over ipv4 works seamlessly, ipv6 has some troubles. We are able to get it working by restarting the CPE and unplug the uplink for approximately two minutes and the client behind the CPE is able to reach the internet over ipv6. If we trigger another restart of the CPE, the bng session for ipv4 and ipv6 get released and reestablished after a few minutes, everything seems fine but the client is not able to reach the internet over ipv6.
We'd appreciate if someone can share their experience with a BNG dual stack setup, especially in case of ipv6 if there's something to look for. Let me know if if can provide some configuration snippets to give you a better insight.
there are many dual-stack deployments, but as there are hardly two BNG deployments that are alike, it would be the best if you could open a service request with Cisco TAC to have this issue properly investigated.
XR-vm - CLI's
look for any process crash, review time stamp[if it is too old, then no immediate action needed]
verify if standby state is Ready and NSR-Ready
show proc cpu | exclude " 0%"
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