3-34
Cisco ONS 15454 DWDM Installation and Operations Guide, R6.0
September 2005
Chapter 3 Turn Up a Node
DLP-G291 Create an IP-Over-CLNS Tunnel
• IS-IS Cost—Sets the cost for sending packets on the LAN subnet. The IS-IS protocol uses the cost
to calculate the shortest routing path. The default IS-IS cost for LAN subnets is 20. It normally
should not be changed.
• DIS Priority—Sets the designated intermediate system (DIS) priority. In IS-IS networks, one router
is elected to serve as the DIS (LAN subnets only). Cisco router DIS priority is 64. For the
ONS 15454 LAN subnet, the default DIS priority is 63. It normally should not be changed.
Step 4 Click OK.
Step 5 Return to your originating procedure (NTP).
DLP-G291 Create an IP-Over-CLNS Tunnel
Caution IP-over-CLNS tunnels require two endpoints. You will create one point on an ONS 15454. The other
endpoint is generally provisioned on non-ONS equipment including routers and other vendor NEs.
Before you begin, verify that you have the capability to create an OSI-over-CLNS tunnel on the other
equipment location.
Step 1 Click the Provisioning > OSI > Tunnels tabs.
Step 2 Click Create.
Step 3 In the Create IP Over OSI Tunnel dialog box, complete the following fields:
• Tunnel Type—Choose a tunnel type:
–
Cisco—Creates the proprietary Cisco IP tunnel. Cisco IP tunnels add the CLNS header to the
IP packets.
–
GRE—Creates a Generic Routing Encapsulation tunnel. GRE tunnels add the CLNS header and
a GRE header to the IP packets.
The Cisco proprietary tunnel is slightly more efficient than the GRE tunnel because it does not add
the GRE header to each IP packet. The two tunnel types are not compatible. Most Cisco routers
support the Cisco IP tunnel, while only a few support both GRE and Cisco IP tunnels. You generally
should create Cisco IP tunnels if you are tunneling between two Cisco routers or between a Cisco
router and an ONS node.
Purpose This task creates an IP-over-Connectionless Network Service (CLNS)
tunnel to allow ONS 15454 nodes to communicate across equipment and
networks that use the OSI protocol stack.
Tools/Equipment None
Prerequisite Procedures NTP-G22 Verify Common Card Installation, page 3-4
DLP-G46 Log into CTC, page 2-25
Required/As Needed As needed
Onsite/Remote Onsite or remote
Security Level Provisioning or higher
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