Filter
Top Products
A-5
Cisco WAN Manager User’s Guide
Version 10.5, Part Number 78-12945-01 Rev. D0, August 2003
AppendixA Internet Connectivity
Functional Description
IP Host
Once the IPATM interface on every MGX 8850 Release 2 is hooked to the IP layer of VxWorks TCP/IP
stack and every SVC has been established between IPATM interface and routers, full connectivity will
exist between all MGX 8850 Release 2 nodes through all routers. This communication path has also been
relayed to the IP host/workstation using a routing protocol such as RIP. The IP host/workstation will now
know, via a IP route, which router will accept data for each MGX 8850 Release 2.
Note If the IP host/workstation does not support the routing protocols used by the routers, the IP routes for
each MGX 8850 Release 2 will have to be manually added on the CWM workstation.
All that remains for the IP host to do is to determine the IP address for each IPATM interface with which
it wants to establish TCP/IP communication. This can be as simple as manually entering these IP
addresses into the host’s host table, or as complex as dynamically determining these IP addresses via
another protocol such as ILMI. In either case it is assumed that the IP host/workstation knows the IP
addresses of the IPATM interfaces for the remainder of this chapter.
Figure A-5 shows the complete IP data-path between the MGX 8850 Release 2 and the IP
host/workstation. The IP Cloud signifies an IP network and can be as simple as a directly attached
ethernet or as complex as a multi-hop, multi-interface type network. Router #1 and Router #2 may or
may not be part of the same IP Cloud.
Figure A-5 IP Connectivity Between MGX 8850 Release 2 and IP workstation
Putting It All Together
It is the job of the IP host/workstation to initiate the IP communication to the MGX 8850 Release 2 by
sending IP data addressed to the IPATM interface of the MGX 8850 Release 2 to the correct router.
Once received by the router, the IP address of the destination of the data (MGX 8850 Release 2) is looked
up in the router’s IP route table. Because the IP address of the MGX 8850 Release 2 has been previously
added to this interfaces route table, the data is given to the ATM interface driver. There, a map table
39164
Telnet
Client/server API (e.g. Sockets)
TCP UDP
IP
IPATM
interface
Router #1
Router #n
S
I
G
A
P
I
FTP
MGX 8850 R2
SV+
SVC
SVC
TimeOfDay
IP
cloud
IP
cloud
IP host/
workstation
IP host/
workstation