Operating instructions

72 Cisco Systems Intelligent Gigabit Ethernet Switch Module
5.3.12 Scenario 6 (not recommended)
򐂰 IGESM management using IGESM uplinks
򐂰 IGESM, Management Module, and Data Traffic all in common VLAN
Figure 5-50 Scenario 6: Physically common management and data networks; Management Module
uplink and IGESM uplinks provide IGESM management path
Scenario 6 is the worst possible design. The issues are as described in scenario 5
(Figure 5-49 on page 71), but we are carrying all traffic on a single VLAN/IP subnet, meaning
that we are also mixing data and management traffic. Additionally, the Management Module
might possibly attempt to proxy for blade servers within the BladeCenter because they share
a common VLAN and presumable IP subnet with the Management Module, causing them to
fail to connect properly (Figure 5-51 on page 73).
Considering the possible issues as described, this design is not advised and will almost
certainly lead to very unsatisfactory operation of the BladeCenter.
Management
Module
IGESM
Bay 1 - 4
Common Management/Data Network
Flow Name Flow Line VLAN Description
All Traffic X All traffic on a single VLAN
Poor Design - Common Network
Management enabled for IGESM uplinks
MM management via MM uplink
IGESM management via IGESM uplink
MM and IGESM use the same VLAN on different uplinks
MM, IGESM and data traffic all on a single VLAN
BladeCenter
VLAN X
802.1Q trunk(s) or
mode access
Mode access
ETH 0
ETH 1
To blade servers
MGMT
Interface
VLAN X
Sw Bay - external
management
over all ports
enabled
VLAN X