Operating instructions

Chapter 5. Cisco Systems IGESM management and user orientation 63
the management VLAN on ports g0/15 and g0/16 the native VLAN, having different
management VLANs results in each IGESM complaining about a native VLAN mismatch in
their respective logs and on their console ports.
Figure 5-43 Discussion of different management VLANs on different IGESMs
If you must place different IGESMs in the same BladeCenter into different management
VLANs, you can stop the native VLAN mismatch messages by turning off CDP on the ports
facing the Management Module (g0/15 and g0/16). This can be done by running the
command no cdp enable on these two ports.
Other reasons for native VLAN mismatch messages appearing on the IGESM include a
native VLAN mismatch between the IGESM and its connecting upstream switch. The issue
discussed in Figure 5-43 is specific to trying to use different management VLANs on different
IGESMs in the same BladeCenter. If you place all of the IGESMs into the same VLAN, and
you are seeing native VLAN mismatch messages, the problem is elsewhere and should be
resolved using standard troubleshooting techniques.
We now present the various scenarios.
1
The hard filter that blocks traffic from the uplink ports from traveling through g0/15 and 16 has no impact on packets
originating from one IGESM traveling over the Management Module to other IGESMs in the chassis.
Mgmt
Module
IGESM in Bay 1
MGMT “Interface VLAN X”
G0/15
ETH 0
ETH 1
IGESM management
packets untagged on
Native VLAN
IGESM
uplinks
IGESM in Bay 2
MGMT “Interface VLAN Y”
G0/15
IGESM
uplinks
Management
Module uplink
To switch Bays
3 and 4
Flow Name Flow Line VLAN Description
Native VLAN X and Y Shows internal IGESM connection via MM