Cisco Ethernet switch Operations Instructions download pdf (Page 72)

58 Cisco Systems Intelligent Gigabit Ethernet Switch Module

As noted, an important aspect of these two network-based management paths is that the

selection of which to use is an

either/or proposition. It is necessary to configure specifically to

manage the IGESM via the Management Modules uplink (as shown in scenarios 1, 2, and

possibly 7) or its own uplinks (as demonstrated in scenarios 3 and 4). Attempting to configure

IGESM management for both paths at the same time usually creates intermittent connectivity

issues when attempting to connect to the IGESM. Scenarios 5 and 6 show examples of

configurations that incorrectly enable and configure for both paths simultaneously.

With that said, the first and perhaps simplest approach for managing the IGESM is to use the

Management Module’s uplink port to manage the IGESM (paths 1 and 2 in Figure 5-40 on

page 57). This connectivity is demonstrated in scenarios 1, 2, and 7 in this section and is also

discussed in more detail below. Because it is simpler to deploy,

using the Management

Module’s uplink to manage the IGESM is preferred

over managing the IGESM via its own

uplinks, with both scenarios 1 and 2 being recommended equally based on the customer’s

requirements.

As already noted, the second approach is to manage the IGESM via its own external uplink

connections, ports G0/17 - 20 (paths 3 and 4 in Figure 5-40 on page 57). This connectivity is

demonstrated in scenarios 3 through 6, and discussed in more detail below.

It is important to note that although scenarios 3 through 6 all show attempts to manage the

IGESM via its own uplink ports, only scenarios 3 and 4 are recommended when using this

path. Scenario 3 is the recommended choice when using IGESM uplink management, but

scenario 4 is still considered a viable option.

Scenarios 5 and 6 are provided in this section only to show possible problems that could arise

with certain designs when using the IGESM uplinks to manage the IGESM, and thus are not

recommended solutions.

In summary, the selection process involves choosing the desired management path and

configuring it appropriately to ensure correct operation. As already noted, using the

Management Module uplink to manage the IGESM (scenarios 1 and 2) is preferred over

using the IGESM uplinks to manage the IGESM (scenarios 3 and 4). However, scenarios 3

and 4 are certainly viable options for those users requiring true in-band management.

The rules for configuring for management over the Management Module’s uplink are listed in

5.3.4, “Considerations: Using the Management Module uplink to manage the IGESM” on

page 59.

The rules for configuring for management over the IGESM’s uplinks are found in 5.3.5,

“Considerations: Using the IGESM uplinks to manage the IGESM” on page 61 below.

VLAN Best Practice

Closely related to the various other recommendations in this section are certain best

practices for VLAN usage and isolation.

There are many possible approaches to VLAN utilization that may work (such as everything

on a single VLAN network), but are they good designs? Do they account for robust security,

predictable traffic flows, and high availability? With that in mind, several items should always

be remembered when designing secure and robust networks—all designs, not just those

involving the IGESM:

򐂰 Normally, avoid the use of VLAN 1 for carrying either management or data traffic.

Note: Descriptions of these scenarios begin on page 64.

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