Configuring ISG Access for IP Subscriber Sessions
Prerequisites for ISG Access for IP Subscriber Sessions
2
• Configuration Examples for ISG Access for IP Subscriber Sessions, page 34
• Additional References, page 38
• Feature Information for ISG Access for IP Subscriber Sessions, page 40
Prerequisites for ISG Access for IP Subscriber Sessions
For information about release and platform requirements, see the “Feature Information for ISG Access for
IP Subscriber Sessions” section on page 40.
• Dynamic Host Configuration Protocol (DHCP) server must support the DHCP lease protocol.
Restrictions for ISG Access for IP Subscriber Sessions
Overlapping IP Address Restrictions
Overlapping IP addresses in the same virtual routing and forwarding (VRF) instance are not supported.
Overlapping IP subscribers in different VRFs are not supported on the same interface for static IP
subscriber sessions and routed IP subscriber sessions. Overlapping IP subscribers in different VRFs are
supported on the same interface for Layer 2 connected Dynamic Host Configuration Protocol (DHCP)
subscriber sessions.
IP Subnet Session Restrictions
IP subnet sessions are not supported on an interface configured with the ip subscriber l2-connected
command. IP subnet sessions are supported only when the ip subscriber routed command is configured
on the interface.
ISG DHCP Restrictions
ISG cannot relay DHCP requests when a Layer 3 DHCP relay agent is between the ISG device and
subscriber devices.
Dynamic VPN Selection Restrictions
Dynamic VPN selection is not supported for IP subnet sessions and subscribers coming in on nonglobal
VRF interfaces.
Dynamic VPN selection is not supported for subscribers with a static VPN configuration on the access
interface.
Dynamic VPN selection with address reassignment is not supported for routed IP subscriber sessions
that are initiated by DHCP. IP addresses of routed IP subscribers must be routable in the access network.
Because Internet service provider (ISP) or VRF-owned private addresses could overlap or be unroutable
in the network between subscribers and the ISG device, it is not possible to assign IP addresses to those
subscribers.
General IP Session Restrictions
Packet of Disconnect (PoD) is not supported for IP subscriber sessions.
IP subscriber sessions are not supported on ambiguous IEEE 802.1QinQ (QinQ) or IEEE 802.1Q
(Dot1Q) subinterfaces.
To Next Page
Loading...
Need help?
General