B-2
Cisco WAN Manager User’s Guide
Version 10.5, Part Number 78-12945-01 Rev. D0, August 2003
AppendixB Networking
Connecting to Cisco WAN Manager
IP Relay
IP Relay is a proprietary protocol used by Cisco WAN switches to pass IP traffic within a Cisco WAN
network. The IP Relay f u nction stops at the gat eway switch.
IP Relay Gateway
The IP Relay gateway is a node in the WAN network used to relay IP traffic for a group of nodes in the
network. When the nodes in the network are geographi cally distributed, or when th e network is large and
you created subnets to manage the network, one node in each subnet can be used to relay the IP traffic
to all the nodes in that subnet that are connected via trunks. IP Relay traffic will pass through a trunk's
Statistical Reserve, but not p a ss over li ne s.
Link0 and Link1
CWM and MGX 8230, BPX 8600, or IGX 8400 series nodes use a proprietary protocol to exchange
network management information. CWM establishes two types of links (Link0 and Link1) with MGX
8230, BPX 8600, or IGX 8400 series nodes. CWM establishes a Link0 link with the CWM Gateway
node, and a Link1 link with al l nodes in the net wo rk. A Li nk 0 lin k i s a lso est abli she d betwe en CWM an d
IGX 8400 series fee der nodes.
Four types of network traffic flow between CWM and the Cis co WAN switches that CWM mana ges , an d
they are as follows:
•Link0—consists of topology and maintenance messages between the CWM workstation and the
CWM gateway node
•Link1—consists of robust messages between the CWM gateway node and other WAN switches
•TFTP—provides file transfers betw ee n nodes
•SNMP—provides a communications path to monitor and control network devices, and to manage
configurations, statistics collect io n, pe rfo r man ce, and security
CWM only uses SNMP and TFTP to communicate with MGX 8220 nodes.
Ports Used by CWM
This section provides information about ports used by CWM for outgoing and incoming
communications.

CWM to Node (Outgoing)

Table B -1 lists the outgoing ports CWM uses to communicate with the nodes.
TableB-1 Outgoing Ports Used by CWM
Protocol Port Function
udp 161 SNMP get, set
udp 69 tftp server