The management interface is an access switchport and has not been assigned to a separate management VLAN.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17824	NET0994	SV-19337r1_rule		Medium

Description
The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interface of the managed network element will be directly connected to the OOBM network. If the device does not have an OOBM port, the interface functioning as the management interface must be configured so that management traffic does not leak into the managed network and that production traffic does not leak into the management network.

Description

The OOBM access switch will connect to the management interface of the managed network elements. The management interface can be a true OOBM interface or a standard interface functioning as the management interface. In either case, the management interface of the managed network element will be directly connected to the OOBM network. If the device does not have an OOBM port, the interface functioning as the management interface must be configured so that management traffic does not leak into the managed network and that production traffic does not leak into the management network.

STIG	Date
Layer 2 Switch Security Technical Implementation Guide - Cisco	2018-08-22

Details

Check Text ( C-20316r1_chk )
Review the managed switch configuration and verify that the access port connected to the OOBM access switch has been assigned to the management VLAN. By default, the management VLAN is VLAN 1; however, the management VLAN must be configured to a different VLAN. As shown in the following configuration example, FastEthernet0/1 is the port connected to the OOBM access switch and VLAN 101 is the management VLAN. interface FastEthernet0/1 switchport access vlan 10 switchport mode access ! interface FastEthernet0/2 switchport access vlan 2 switchport mode access ! interface FastEthernet0/3 switchport access vlan 2 switchport mode access ! interface FastEthernet0/4 switchport access vlan 2 switchport mode access This can also be verified by entering a Privileged EXEC show vlan command on the switch CLI as illustrated in the following example output of a Cisco 2950: 2950#show vlan VLAN Name Status Ports ---- ------------------------ --------- ------------------------------- 2 Production active Fa0/2, Fa0/3, Fa0/4, Fa0/5, ... Fa0/21, Fa0/22, Fa0/23, Fa0/24 10 Management active Fa0/1

Check Text ( C-20316r1_chk )

Review the managed switch configuration and verify that the access port connected to the OOBM access switch has been assigned to the management VLAN. By default, the management VLAN is VLAN 1; however, the management VLAN must be configured to a different VLAN. As shown in the following configuration example, FastEthernet0/1 is the port connected to the OOBM access switch and VLAN 101 is the management VLAN.

interface FastEthernet0/1
switchport access vlan 10
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 2
switchport mode access
!
interface FastEthernet0/3
switchport access vlan 2
switchport mode access
!
interface FastEthernet0/4
switchport access vlan 2
switchport mode access

This can also be verified by entering a Privileged EXEC show vlan command on the switch CLI as illustrated in the following example output of a Cisco 2950:

2950#show vlan
VLAN Name Status Ports
---- ------------------------ --------- -------------------------------
2 Production active Fa0/2, Fa0/3, Fa0/4, Fa0/5,
...
Fa0/21, Fa0/22, Fa0/23, Fa0/24
10 Management active Fa0/1

Fix Text (F-17739r1_fix)
If the management interface is an access switchport, assign it to a separate management VLAN while the remainder of the access switchports can be assigned to user VLANs belonging to the managed network. This provides some level of separation between the management network and the managed network.