Configuring System Port Profiles
This chapter describes system port profiles and how to configure them.
This chapter includes the following sections:
•Information About System Port Profiles
•Guidelines and Limitations for System Port Profiles
•Creating a System Port Profile
•Deleting System VLANs from a Port
•Modifying the System VLANs in a Port Profile
•Feature History for System Port Profiles
Information About System Port Profiles
System port profiles are designed to establish and protect those ports and VLANs which need to be configured before the VEM contacts the VSM.
For this reason, the following ports must use system VLANs:
•Control and packet VLANs in the uplinks that communicate with the VSM.
•Management VLAN in the uplinks and VMware kernel NICs used for VMware vCenter server connectivity or SSH or Telnet connections.
•Storage VLAN used by the VSM for VM file system access in the uplinks and VMware kernel NICs used for iSCSI or network file systems. This is needed only in the host that runs the VSM on the VEM.
•VSM ports on the VEM must be system ports.
For more information about system port profiles and system VLANs, see the Cisco Nexus 1000V Getting Started Guide, Release 4.2(1)SV1(4).
For a summary of the default settings used with port profiles, see the "Default Settings" section on page 2-2.
Guidelines and Limitations for System Port Profiles
System port profiles and system VLANs are subject to the following guidelines and limitations:
•System VLANs must be used sparingly and only as described in the "Information About System Port Profiles" section.
•In a single ESX host, one VLAN can be a system VLAN on one port but a regular VLAN on another.
•You cannot delete a system VLAN when the port profile is in use.
•You can add or delete VLANs that are not system VLANs when the port profile is in use because one or more distributed virtual switch (DVS) ports are carrying that profile.
•System VLANs can be added to a port profile, even when the port profile is in use.
•You can only delete a system VLAN from a port profile after removing the port profile from service. This is to prevent accidentally deleting a critical VLAN, such as the management VLAN for a host, or the storage VLAN for the VSM.
•A system port profile cannot be converted to a port profile that is not a system port profile.
•The native VLAN on a system port profile can be a system VLAN but it does not have to be.
•When a system port profile is in use, you can change the native VLAN as follows:
–From one VLAN that is not a system VLAN to another VLAN that is not a system VLAN.
–From a VLAN that is not a system VLAN to a system VLAN
–From one system VLAN to another system VLAN
•When a system port profile is in use, you cannot change the native VLAN from a system VLAN to a VLAN that is not a system VLAN.
•Reboots of the ESX can result in an MTU mismatch and failure of the VSM and VEM. If you use an MTU other than 1500 (the default), for example in networks with jumbo frames, then you must configure the MTU in the system port profile so that it is preserved across reboots of the ESX.
•If you shut down a vEthernet port that is inheriting a system port profile, the VEM continues to pass traffic. In this case, you must also shut down the port by unchecking the active NIC on the VM itself.
Creating a System Port Profile
You can use this procedure to configure a system port profile for critical ports.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
•You are logged in to the CLI in EXEC mode.
•The VSM is connected to vCenter server.
•You have configured the following:
–Port admin status is active (no shutdown).
–Port mode is access or trunk.
–VLANs that are to be used as system VLANs already exist.
–VLANs are configured as access VLANs or trunk-allowed VLANs.
•Once a port profile is created, you cannot change its type (Ethernet or vEthernet).
•The MTU size you set for the system MTU must be less than the MTU size set for the system jumbomtu.
For more information, see the Cisco Nexus 1000V Interface Configuration Guide, Release 4.2(1)SV1(4).
•When you configure a system MTU on a system port profile, it takes precedence over a MTU you may have configured on the interface.
For more information, see the Cisco Nexus 1000V Interface Configuration Guide, Release 4.2(1)SV1(4).
SUMMARY STEPS
1. config t
2. port-profile [type {ethernet | vethernet}] profilename
3. description profiledescription
4. switchport mode trunk
5. switchport trunk allowed vlan vlan-id-list
6. system vlan vlan-id-list
7. (Optional) system mtu mtu-size
8. show port-profile [brief | expand-interface | usage] [name profilename]
9. copy running-config startup-config
DETAILED STEPS
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Step 1 |
config t
Example: n1000v# config t n1000v(config)# |
Enters global configuration mode. |
Step 2 |
port-profile [type {ethernet | vethernet}] name
Example: n1000v(config)# port-profile AccessProf n1000v(config-port-prof)# |
Enters port profile configuration mode for the named port profile. •name—The port profile name can be up to 80 characters and must be unique for each port profile on the Cisco Nexus 1000V. •type—(Optional) The port profile type can be Ethernet or vEthernet. Once configured, the type cannot be changed. The default is the vEthernet type. Defining a port profile type as Ethernet allows the port profile to be used for physical (Ethernet) ports. In the vCenter Server, the corresponding port group can be selected and assigned to physical ports (PNICs). Note If a port profile is configured as an Ethernet type, then it cannot be used to configure VMware virtual ports. |
Step 3 |
description profiledescription
Example: n1000v(config-port-prof)# description System profile for critical ports n1000v(config-port-prof)# |
Adds a description of up to 80 ASCII characters to the port profile. This description is automatically pushed to the vCenter Server. |
Step 4 |
switchport mode trunk
Example: n1000v(config-port-prof)# switchport mode trunk n1000v(config-port-prof)# |
Designates that the interfaces are to be used as a trunking ports. A trunk port transmits untagged packets for the native VLAN and transmits encapsulated, tagged packets for all other VLANs. |
Step 5 |
switchport trunk allowed vlan vlan-id-list
Example: n1000v(config-port-prof)# switchport trunk allowed vlan 114,115 n1000v(config-port-prof)# |
Designates the port profile as trunking and defines VLAN access to it as follows: •allowed-vlans—Defines VLAN IDs that are allowed on the port. •add—Lists VLAN IDs to add to the list of those allowed on the port. •except—Lists VLAN IDs that are not allowed on the port. •remove—Lists VLAN IDs whose access is to be removed from the port. •all—Indicates that all VLAN IDs are allowed on the port, unless exceptions are also specified. •none—Indicates that no VLAN IDs are allowed on the port. If you do not configure allowed VLANs, then the default VLAN 1 is used as the allowed VLAN. |
Step 6 |
system vlan vlan-id-list
Example: n1000v(config-port-prof)# system vlan 114,115 n1000v(config-port-prof)# |
Adds system VLANs to this port profile. |
Step 7 |
system mtu mtu-size
Example: n1000v(config-port-prof)# system mtu 4000 n1000v(config-port-prof)# |
(Optional) Designates the MTU size. •If you do not set the MTU size here, the default of 1500 is used. •Must be an even number between 1500 and 9000. •Must be less than the size of the system jumbomtu on the interface. |
Step 8 |
show port-profile [brief | expand-interface | usage] [name profile-name]
Example: n1000v(config-port-prof)# show port-profile name AccessProf |
(Optional) Displays the configuration for verification. |
EXAMPLE
This example shows how to create a system port profile:
n1000v(config)# port-profile AccessProf
n1000v(config-port-prof)# description "System profile for critical ports"
n1000v(config-port-prof)# system vlan 1
n1000v(config-port-prof)# show port-profile name AccessProf
inherit: port-profile xyz
switchport trunk allowed vlan 1-10
channel-group auto mode on sub-group cdp
evaluated config attributes:
switchport trunk allowed vlan 1-10
channel-group auto mode on sub-group cdp
Deleting System VLANs from a Port
You can use this procedure to delete system VLANs from a port from vCenter server.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
•You are logged in to vCenter server.
•The VSM is connected to vCenter server.
DETAILED STEPS
Step 1 From vCenter server, delete the port from the DVS.
Step 2 Add the port to vCenter with a different or modified port profile.
Modifying the System VLANs in a Port Profile
You can use the following procedures in this section to modify the system VLANs in a port profile without removing all system VLANs.
•Modifying the System VLANs in a Trunk Mode Port Profile
•Modifying System VLANs in an Access Mode Port Profile
Modifying the System VLANs in a Trunk Mode Port Profile
You can use this procedure to change the set of system VLANs in a trunk mode port profile without removing all system VLANs.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
•You are logged in to vCenter server.
•You are logged in to the Cisco Nexus 1000V CLI in EXEC mode.
•The VSM is connected to vCenter server.
•You know the VLAN ID of a system VLAN in your network. It does not matter which system VLAN it is.
•You know the VLAN IDs of the system VLANs required for the port profile you are modifying.
DETAILED STEPS
Step 1 From the upstream switch for each VEM that carries this profile, shut off the switchport that carries the control VLAN.
The VEMs are disconnected from the VSM.
Step 2 From the Cisco Nexus 1000V, use the following commands to convert the port profile to an access profile with a system VLAN. It does not matter which system VLAN you use.
config t
port-profile name
no system vlan
switchport mode access
switchport access vlan vlan-id
system vlan vlan-id
n1000v(config)# port-profile Trunk_System_Prof
n1000v(config-port-prof)# no system vlan
n1000v(config-port-prof)# switchport mode access
n1000v(config-port-prof)# switchport access vlan 1
n1000v(config-port-prof)# system vlan 300
The trunk port profile is converted to an access port profile with a system VLAN.
Step 3 From the Cisco Nexus 1000V, use the following commands to convert the port profile back to a trunk profile with the required system VLAN IDs.
config t
port-profile name
switchport mode trunk
system vlan vlan-id-list
show port-profile [brief | expand-interface | usage] [name profile-name]
copy running-config startup-config
n1000v(config)# port-profile Trunk_System_Prof
n1000v(config-port-prof)# switchport mode trunk
n1000v(config-port-prof)# system vlan 114,115
n1000v(config-port-prof)# show port-profile name Trunk_System_Prof
port-profile Trunk_System_Prof
switchport trunk allowed vlan all
evaluated config attributes:
switchport trunk allowed vlan all
n1000v(config-port-prof)# copy running-config startup-config
The port profile is changed back to a trunk profile with the required system VLANs, and the changes are saved in the running configuration.
Step 4 From the upstream switch for each VEM that carries this profile, unshut the switchport that carries the control VLAN.
The VEMs are reconnected to the VSM.
Modifying System VLANs in an Access Mode Port Profile
You can use this procedure to change the set of system VLANs in an access port profile without removing all system VLANs.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
•You are logged in to vCenter server.
•You are logged in to the Cisco Nexus 1000V CLI in EXEC mode.
•The VSM is connected to vCenter server.
•You know the VLAN IDs of the system VLANs required for the port profile you are modifying.
DETAILED STEPS
Step 1 From the upstream switch for each VEM that carries this profile, shut off the switchport that carries the control VLAN.
The VEMs are disconnected from the VSM.
Step 2 From the Cisco Nexus 1000V, use the following commands to configure a new list of system VLANs in the port profile.
config t
port-profile name
system vlan vlan-id-list
show port-profile name profile-name]
copy running-config startup-config
n1000v(config)# port-profile Access_System_Prof
n1000v(config-port-prof)# system vlan 114,115
n1000v(config-port-prof)# show port-profile name Access_System_prof
port-profile Access_System_Prof
switchport trunk allowed vlan all
evaluated config attributes:
switchport trunk allowed vlan all
n1000v(config-port-prof)# copy running-config startup-config
The list of system VLANs is changed and saved in the running configuration.
Step 3 From the upstream switch for each VEM that carries this profile, unshut the switchport that carries the control VLAN.
The VEMs are reconnected to the VSM.
Feature History for System Port Profiles
This section provides the feature history for system port profiles.
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System Port Profiles |
4.0(4)SV1(1) |
This feature was introduced. |
system mtu |
4.0(4)SV1(3) |
The system mtu command allows you to preserve a non-default MTU setting on the PNIC attached to the Cisco Nexus 1000V across reboots of the ESX server. |