The config>subscr-mgmt>ppp-policy max-sessions-per-cid command limits the number of PPPoE sessions with the same Agent Circuit ID that can be active on the same SAP or MSAP.
The limit is enforced in the discovery phase, before PAP or CHAP authentication based on the Agent Circuit ID sub-option that is present in the vendor-specific PPPoE access loop identification tag added in PADI and PADR messages by a PPPoE intermediate agent.
By default, PPPoE PADI messages without the Agent Circuit ID sub-option are dropped when a max-sessions-per-cid limit is configured.
3502 2020/06
16 11:02:57.949 UTC MINOR: SVCMGR #2214 Base Managed SAP creation failure
"The system could not create Managed SAP:1/1/
4:2111.100, MAC:00:00:64:6b:01:07, Capturing SAP:1/1/
4:*.*, Service:10. Description: Agent Circuit ID sub-
option missing in PADI and per circuit id limit configured"
The default behavior can be overruled with the optional allow-sessions-without-cid keyword. PPPoE sessions without an Agent Circuit ID can be established on a SAP with a max-sessions-per-cid limit configured. The max-sessions-per-cidmax-sessions-per-cid limit is not applied to these sessions.
When the max-sessions-per-cid limit is not configured, no limit is placed on the number of PPPoE sessions with the same Agent Circuit ID on the same SAP or MSAP and PPPoE sessions with or without an Agent Circuit ID can be established.