Preprovisioning Guidelines
The 7705 SAR platforms each have two ports on the chassis to connect terminals for management access: a console port for a terminal connection and a management port for a Telnet connection.
The console port is used to configure parameters locally through a direct connection from a system console. The management port is used to configure parameters remotely through a connection to a remote workstation, using Telnet or SSH to open a secure shell connection.
For more information about management connections, see the appropriate chassis installation guide, in the section on router management connections.
Predefining Entities
To initialize an adapter card, the IOM type and adapter card type must match the preprovisioned parameters. In this context, preprovisioning means to configure the entity type (IOM type, adapter card type, port, and interface) that is planned for an adapter card. Preprovisioned entities can be installed but not enabled, or the slots can be configured but remain empty until populated. Provisioning means that the preprovisioned entity is installed and enabled.
You can preprovision ports and interfaces after the IOM is activated (card slot and card type are designated) and adapter card types are specified.
Preprovisioning a Port or SCADA Bridge
Before a port or SCADA bridge can be configured, the adapter card slot must be preprovisioned with an allowed adapter card type (for a SCADA bridge, the only type allowed is isc, for the Integrated Services card).
Preprovisioning recommendations (for ports only) include:
Ethernet
Configure an access port for customer-facing traffic on which services are configured.
Configure a network port for uplink traffic.
An encapsulation type must be specified to distinguish services on the access port. Encapsulation types must also be specified for network ports. By default, the encapsulation type for Ethernet ports in network mode is null.
SONET/SDH
SONET/SDH can be used only when configuring an OC-3 or OC-12 SONET path on an appropriate adapter card.
Configure a network port or channel to participate in the service provider transport or infrastructure network.
To configure a SONET path, see Configuring SONET/SDH Port Parameters.
Channelized
Channelized ports can be configured on the following adapter cards and modules:
16-port T1/E1 ASAP Adapter card
32-port T1/E1 ASAP Adapter card
2-port OC3/STM1 Channelized Adapter card
4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
8-port Voice & Teleprotection card (access mode only)
8-port C37.94 Teleprotection card (access mode only)
8-port FXO Adapter card (access mode only)
6-port FXS Adapter card (access mode only)
4-port DS3/E3 Adapter card (DS3 ports only)
12-port Serial Data Interface card (access mode only)
6-port E&M Adapter card (access mode only)
4-port T1/E1 and RS-232 Combination module
Configure an access port for customer-facing traffic on which services are configured.
Configure a network port for uplink traffic.
An encapsulation type must be specified to distinguish services on the access port or channel. For network mode, the encapsulation type is set to ppp-auto and cannot be changed.
Maximizing Bandwidth Use
After ports are preprovisioned, multilink bundles (MLPPP) or IMA groups can be configured to increase the bandwidth available between two nodes.
The following cards, modules, and platforms support multilink bundles:
16-port T1/E1 ASAP Adapter card
32-port T1/E1 ASAP Adapter card
2-port OC3/STM1 Channelized Adapter card
4-port OC3/STM1 / 1-port OC12/STM4 Adapter card
T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on 7705 SAR-H)
T1/E1 ports on the 7705 SAR-A
T1/E1 ports on the 7705 SAR-M
T1/E1 ports on the 7705 SAR-X
The following cards, modules, and platforms support IMA groups:
2-port OC3/STM1 Channelized Adapter card
16-port T1/E1 ASAP Adapter card
32-port T1/E1 ASAP Adapter card
T1/E1 ports on the 7705 SAR-M
All physical links or channels in a bundle or group combine to form one logical connection. A bundle or group also provides redundancy in case one or more links that participate in the bundle fail. For command syntax, see Configuring Multilink PPP Bundles. To configure channelized ports for TDM, see Configuring Channelized Ports.
For 12-port Serial Data Interface cards and the RS-232 ports on the 4-port T1/E1 and RS-232 Combination module, some or all of a port bandwidth can be dedicated to a channel by aggregating a number of DS0s into a single bundle. Serial data transmission rates below the rate of a single DS0, that is, less than 64 kb/s, are achieved using the High Capacity Multiplexing (HCM) proprietary protocol. These rates are known as subrates, and are supported only when operating in RS-232 mode or X.21 mode.
Using Partial Bandwidth
Fractional T1/E1 allows one or more DS0 channels to be bundled together (up to the maximum bandwidth of the network link), allowing the customer to use only that portion of the link that is needed. This means that the PPP service can use a selected number of timeslots (octets) in the network T1 or E1 link, thus reducing the amount of T1 or E1 bandwidth that must be leased or purchased from the attached carrier. This leads to multiplexing efficiencies in the transport network.
The following cards and platforms support fractional T1/E1 on a PPP channel group (encapsulation type ppp-auto), or all timeslots on T1/E1 ports, in network mode:
16-port T1/E1 ASAP Adapter card
32-port T1/E1 ASAP Adapter card
T1/E1 ports on the 4-port T1/E1 and RS-232 Combination module (on 7705 SAR-H)
T1/E1 ports on the 7705 SAR-A
T1/E1 ports on the 7705 SAR-M
T1/E1 ports on the 7705 SAR-X
Only one channel group can be configured per port. When the channel group is configured for ppp-auto encapsulation and network mode, all timeslots (channels) are automatically allocated to the channel group. The user can then configure the number of timeslots needed. Timeslots not selected cannot be used.