Extreme Networks BlackDiamond 10808, Hardware Installation Manual

Page: 80 / 424

BlackDiamond 10808 Series Modules
Extreme Networks Consolidated ExtremeXOS Hardware Installation Guide
80
The MSM consists of a printed circuit board mounted on a metal panel that acts as the insertion vehicle
in a BlackDiamond 10808 switch. The module carrier also includes ejector/injector levers and captive
retaining screws at each end of the module front panel.
A compact flash slot allows you to insert an external compact flash memory card. (See “External
Compact Flash Memory Card” on page 44 for more information about Extreme Networks-supported
compact flash cards.).
The MSM has the following ports:
●
Console port—Used to connect a terminal and perform local management.
●
Management port—Used to connect an Ethernet cable directly from your laptop into the
management port to view and locally manage the switch configurations. This port can also be used
to connect the system into a parallel management network for administration.
MSM Activity
The BlackDiamond 10808 switch can operate with a single MSM installed. When you install a second
MSM, one of the MSMs operates as the
primary , and the other becomes the backup .
The primary MSM is responsible for upper-layer protocol processing and system management
functions. For example, OSPF computation and SNMP functions are performed by the primary MSM.
Packet handling is distributed among the CPUs of all installed MSMs.
When you save the switch configuration, it is saved to all MSMs. If you download a new ExtremeXOS
image, the image is downloaded to all MSMs.
Selection of the primary MSM occurs automatically. The following examples describe the selection
process:
●
When the BlackDiamond 10808 switch boots with two MSMs already installed, the MSM in slot A
becomes the primary MSM.
●
When the BlackDiamond 10808 switch boots with a single MSM (regardless of the slot position), it is
selected as the primary MSM.
If a second MSM is added to the switch after it has been powered on, the added MSM becomes the
backup MSM. MSMs that operate as backups can be inserted and removed without disrupting
network services.
●
If you remove the primary MSM while the BlackDiamond 10808 switch is operating, the backup
MSM experiences a soft reset and then becomes the primary MSM.
For example, in a BlackDiamond 10808 switch with a primary MSM in slot A and a backup MSM in
slot B, if you remove the primary MSM from slot A, the backup MSM in slot B becomes the primary
MSM.