IES for In-band Management
Page 330 7705 SAR OS Services Guide
IES for In-band Management
In the HSDPA offload application (see HSDPA Offload on page 57), the main uplink out of
a typical cell site is over the ATM network using leased lines. Mission-critical traffic such as
voice, signaling, and synchronization traffic is carried over the ATM network.
Internet Enhanced Service (IES) provides a reliable means of diverting the node
management IP packets from the DSL IP network to the more reliable Layer 2 ATM
network. To do this, IES provides an IP address and interworking function between the
Layer 3 IP network and the Layer 2 ATM network. Without this capability, the in-band IP
management traffic for the 7705 SAR could only be connected to an IP network.
IES can be used for in-band management of the 7705 SAR over the ATM network. IP over
an ATM SAP bound to IES is for in-band management purposes only, and IP traffic from the
ATM SAP is only extracted to the CSM; it is not forwarded.
IES management service is supported on the 16-port T1/E1 ASAP Adapter card of the
7705 SAR-8 or on the T1/E1 ports of the 7705 SAR-F. The service can be created on an
ATM port or on an IMA group.
In the 7705 SAR, all traffic received over IES management SAPs is extracted directly to the
control plane (CSM) in the same way as management traffic received over the CSM console
port or Ethernet management port, or management traffic destined for the 7705 SAR over an
Ethernet or MLPPP encapsulated network port. With IES management, the traffic
transported is always IP packets. At the termination point of the ATM link, the IP packets
are extracted to the CSM for further processing.
Setting Up Connections Between the 5620 SAM and the
7705 SAR
IP over ATM is used for in-band management of the 7705 SAR. This requires the use of IP
addresses so that the packets can be routed through the network using a routing table to
indicate the next hop. Because Apipe interfaces (SAPs) do not have IP addresses, Apipes
cannot be used to carry the management traffic.
With IES, the ATM SAP can be used for the forwarding of management IP packets. To set
up a connection, IES is enabled on an interface on the 7705 SAR and the IP address for the
interface is defined. A PVCC connection is then set up between the 7705 SAR and the
remote router (SR) attached to the network manager (5620 SAM).
The IP datagrams are encapsulated into AAL5 for transport over the ATM network.
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