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Cisco ONS 15454 Reference Manual, R7.0.1
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Chapter 13 Management Network Connectivity
13.7 13.7.7 OSI Virtual Routers
Figure 13-26 Provisioning OSI Routers
Each router has an editable manual area address and a unique NSAP System ID that is set to the node
MAC address + n. For Router 1, n = 0. For Router 2, n = 1. For Router 3, n = 2. Each router can be
enabled and connected to different OSI routing areas. However, Router 1 is the primary router, and it
must be enabled before Router 2 and Router 3 can be enabled. The Router 1 manual area address and
System ID create the NSAP address assigned to the node’s TID. In addition, Router 1 supports OSI
TARP, mediation, and tunneling functions that are not supported by Router 2 and Router 3. These
include:
• TID-to-NSAP resolution
• TARP data cache
• IP-over-CLNS tunnels
• FTAM
• FT-TD
• T-TD
• LAN subnet
OSI virtual router constraints depend on the routing mode provisioned for the node. Table 13-16 shows
the number of IS L1s, IS L1/L2s, and DCCs that are supported by each router. An IS Level1 and IS
Level1/Level2 support one ES per DCC subnet and up to 100 ESs per LAN subnet.
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