Cisco Systems ONS 15600 manual OSI Virtual Routers, TD Protocol Flow

Chapter 9 Management Network Connectivity

9.7.7 OSI Virtual Routers

Figure 9-23

OSS

TL1

T–TD Protocol Flow

GNE

TL1 Gateway

ENE

TL1 Gateway

UDP TCP

IPv4

LLC1

LAN

TL1

UDP TCP

IPv4

LLC1

LAN

ACSE

Presentation

Session

TP4

ISIS / CLNS

LAPD

DCC

ACSE TL1

Presentation

Session

TP4

ISIS / CLNS

LAPD

DCC

131954

•FT–TD—Performs an FTP conversion between FTAM and FTP. The FT–TD gateway entity includes an FTAM responder (server) and an FTP client, allowing FTAM initiators (clients) to store, retrieve, or delete files from an FTP server. The FT–TD gateway is unidirectional and is driven by the FTAM initiator. The FT–TD FTAM responder exchanges messages with the FTAM initiator over the full OSI stack. Figure 9-24shows the FT–TD protocol flow.

Figure 9-24 FT–TD Protocol Flow

OSS			GNE
			FT-TD
FTP File	FTP / IP
Server
		FTP		FTAM
		Client		Responder

FTAM / OSI

ENE

FTAM

Initiator

131955

The ONS 15600 uses FT–TD for the following file transfer processes:

•Software downloads

•Database backups and restores

9.7.7OSI Virtual Routers

The ONS 15600 supports twelve OSI virtual routers. The routers are provisioned on the Provisioning > OSI > Routers tab. 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, and for Router12, n = 11. 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 Routers 2 through 12 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 Routers 2 through 12. These include:

•TID-to-NSAP resolution

•TARP data cache

•IP-over-CLNS tunnels

•FTAM

Cisco ONS 15600 Reference Manual, R7.2

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