Specifications

1-25
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 1 Preparing for Configuration
Guidelines for Creating an IP Address Plan
Guidelines for Creating an IP Address Plan
The switch provides the following interfaces for CLI, SNMP, and CWM access:
• Console Port (CP)
• Maintenance Port (MP)
• LAN 1 port
• ATM i n t e r f a ce
Basic switch configuration and management can be completed by using a local terminal connected to the
console port. However, to configure and manage the switch from a LAN connection, a modem
connection, or with CWM, you need define an IP address for the appropriate interface.
Note This section discusses remote connectivity through the PXM45 LAN port. For information on using
terminal servers, modems and CWM to access the switch, see Appendix C, “Supporting and Using
Additional CLI Access Options.”
A typical switch configuration requires either one or two IP addresses for LAN access. When the switch
hosts a single PXM45 card, use just one IP address and assign it to both the boot and LAN IP address
options (more on this later in this section). When the switch uses two PXM45 cards, you can choose to
use one or two IP addresses. Figure 1-11 shows a redundant PXM45 configuration that uses two IP
addresses.
Figure 1-11 Using Two IP Addresses for Switch Access
The configuration shown in Figure 1-11 provides the following benefits:
• Direct access to the active PXM45 using address B.B.B.B.
• Direct access to the standby PXM45 card using address A.A.A.A.
• The boot code on the standby PXM45 card can be upgraded without interrupting service on the
active PXM45 card.
• You can perform additional procedures in backup boot mode on the standby card without
interrupting the active card. These procedures include hard disk formats and file transfers.
When different IP addresses are used for the boot and LAN IP addresses, you can manage the active
PXM45 card and the switch using the LAN or disk IP address, which is B.B.B.B in Figure 1-11. You can
also access the standby PXM45 card using the boot IP address. When the same address is used for both
the boot and LAN IP addresses, that address can be used only to manage the active PXM45 card.
Boot IP
address:
A.A.A.A
Boot IP
address:
A.A.A.A
Slot 7 PXM45 Slot 8 PXM45
53200
Node or disk IP address: B.B.B.B