Routers > Subnets
Use the Routers > Subnets subtab to view and manage OSI subnetwork point of attachment parameters. The parameters are initially provisioned when you enable a subnet on an RS-DCC, MS-DCC, GCC, optical service channel (OSC), or LAN interface.
 
Item
Description
Router #
Displays the OSI virtual router where the subnet (RS-DCC, MS-DCC, GCC, or OSC) is provisioned.
Slot/Port
Displays the subnet slot and port.
Subnet Type
Displays the interface where the subnet is provisioned, either RS-DCC, MS-DCC, GCC, OSC, or LAN.
Protocol
Displays the data link protocol that is provisioned for the subnet, which is either PPP (Point to Point Protocol), LAP-D (Link Access Protocol on the D Channel), or (IEEE) 802.3 for LAN subnets.
ESH (sec)
Displays the End System Hello PDU propagation frequency. End system NEs transmit ESHs to inform other ESs and ISs about the NSAPs it serves. The default is 10 seconds. The range is 10 to 1000 seconds.
ISH (sec)
Displays the Intermediate System Hello PDU propagation frequency. Intermediate system NEs send ISHs to other ESs and ISs to inform them about the NETs it serves. The default is 10 seconds. The range is 10 to 1000 seconds.
IIH (sec)
Displays the Intermediate System to Intermediate System Hello PDU propagation frequency. The IS-IS Hello PDUs establish and maintain adjacencies between ISs. The default is 3 seconds. The range is 1 to 600 seconds.
DIS Priority
Displays the designated intermediate system (DIS) priority. In IS-IS networks, one router is elected as the DIS. For Cisco routers, the DIS priority is 64. For the ONS 15454 SDH LAN subnet, the default DIS priority is 63. This priority should not be changed.
IS-IS Cost
Displays the cost for sending packets on the subnet. The metric cost is used by OSPF routers to calculate the shortest path. The default metric cost for LAN subnets is 20. It normally should not be changed.
Enable LAN Subnet
(Router 1 only) Enables OSI over the LAN, that is, activates the IS-IS protocol on the LAN so OSI traffic is enabled on the LAN.
Edit
Displays the Edit Subnet dialog box where you can edit subnet parameters.
Disable LAN Subnet
(Router 1 only) Disables OSI over the LAN if it has been enabled.
Help
Displays context-sensitive help.

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