Packet Handling On Subscriber Interfaces - Cisco ASR 9000 Series Configuration Manual

Packet Handling on Subscriber Interfaces

Command or Action
Defining VRF in a Dynamic Template: An example
configure
dynamic-template
type ipsubscriber ipv6-sub-template
vrf vrf1
end
!!
Packet Handling on Subscriber Interfaces
This section describes how subscriber interfaces are supported in certain special cases. These special cases
include L3 forwarded interfaces. As a result, this support is applicable only to PPP over Ethernet PPP
Termination and Aggregation (PPPoE PTA) and IPoE sessions.
Most subscriber data packets are forwarded directly by the network processing unit (NPU). There are certain
special cases where the NPU does not completely handle the data packet. These special cases are handled by
the CPU, and go through an internal interface created for this purpose. This internal interface is named the
Subscriber Interface or SINT. SINT is an aggregate interface, which is used by all packets punted on subscriber
interfaces. There is one SINT for each node. When the BNG package is installed, by default the SINT is
created. The SINT interfaces are needed for punt-inject of packets on subscriber interfaces.
These special cases are supported for both IPoE and PPPoE PTA:
Note These special cases do not apply to PPPoE L2TP, because it is an L2 service.
• Ping to and from subscriber
Cisco ASR 9000 Series Aggregation Services Router Broadband Network Gateway Configuration Guide,
Release 4.3.x
170
BNG allows the receiving of a ping request from both IPoE and PPPoE PTA subscriber interfaces; this
is consistent with other non-BNG interface types as well. Similarly, BNG also allows the sending of a
ping request to both IPoE and PPPoE PTA subscriber interfaces. This includes:
• various lengths of ping packets including lengths exceeding the subscribers MTU size
• subscriber in the default and private VRFs
• various ping options such as type of service, DF set, and verbose
BNG also supports receiving a ping request from both IPv4 and IPv6 subscribers.
Establishing Subscriber Sessions
Purpose
• Yes— Saves configuration changes and exits the
configuration session.
• No—Exits the configuration session without
committing the configuration changes.
• Cancel—Remains in the configuration mode,
without committing the configuration changes.
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