WESM zl Management and Configuration Guide WT.01.28 and greater

6-12
IP Services—IP Settings, DHCP, and DNS
IP Routing
IP Routing
As discussed in Chapter 1: “Introduction,” the Wireless Edge Services zl Module and
its internal uplink port operate at Layer3 of the Open Systems Interconnection (OSI)
model. As part of this Layer 3 functionality, the Wireless Edge Services zl Module
maintains a route table. You can view the route table, which automatically lists
directly connected interfaces, and you can add static routes to the route table. You
can also assign IP addresses to as many as eight VLANs, which then become directly
connected interfaces, and you can enable routing between these VLANs.
The Wireless Edge Services zl Module’s route table is completely separate from the
route table maintained by the wireless services-enabled switch. The IP addresses that
you assign to VLANs on the module are stored and maintained in the module’s
running-config. If you want to assign IP addresses to VLANs on the wireless services-
enabled switch, you must access the command line interface (CLI), the menu system,
or the Web browser interface for the switch itself.
By default, IP routing is disabled. Turning routing on enables these functions:
■ DHCP relay
■ the internal firewall, including IP ACLs applied to logical (VLAN) interfaces
■ Network Address Translation (NAT)
Route Table
When the Wireless Edge Services zl Module receives an IP address from a DHCP
server, the address is assigned to the default management interface, which is typically
VLAN 1. The module automatically recognizes the subnetwork directly connected
to the default management interface and lists this information in its route table. In
the example shown in Figure 6-8, the default management interface (which, in this
case, is VLAN 1) is directly connected to network 10.4.1.0/24.