Configuring ISG Access for IP Subscriber Sessions
Information About ISG Access for IP Subscriber Sessions
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IP subscriber sessions are not supported on interfaces that receive multiprotocol label switching (MPLS)
packets.
Modular quality of service (QoS) command-line interface (CLI) based (MQC) shaping and queueing is
supported in the egress direction in the default class for IP subscriber sessions.
ISG IP subscriber functionality is not supported on the following types of access interfaces:
• Gigabit EtherChannel (Port Channel)
• Generic routing encapsulation (GRE)
• PPP (virtual-template)
• Layer 2 Tunnel Protocol (L2TP)
ISG IP interface sessions are not supported.
Interface statistics are not generated for ISG multiservice interfaces.
Stateful switchover (SSO) and In Service Software Upgrade (ISSU) are not supported for ISG IP
subscriber sessions or traffic class sessions. Upon switchover, an IP session must be re-created or
restarted (for DHCP sessions) when the session becomes active again.
SSO and ISSU are not supported for any features on IP subscriber sessions or traffic class sessions.
Information About ISG Access for IP Subscriber Sessions
Before you configure ISG access for subscriber sessions, you should understand the following concepts:
• Types of IP Subscriber Sessions, page 3
• IP Subscriber Connectivity, page 5
• IP Subscriber Session Initiation, page 6
• IP Subscriber Addressing, page 6
• IP Subscriber Identity, page 8
• VPN Connectivity and Services for IP Subscribers, page 10
• IP Session Termination, page 12
• IP Session Recovery for DHCP-Initiated IP Sessions, page 13
• Default Services for IP Subscriber Sessions, page 13
Types of IP Subscriber Sessions
ISG supports the following types of IP subscriber sessions on Cisco IOS XE software:
• IP Sessions, page 4
• IP Interface Sessions, page 4
• IP Subnet Sessions, page 4
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