Cisco NX-OS/IOS Interface Comparison
From DocWiki
Line 36: | Line 36: | ||
* When assigning interfaces to a VDC on the 48 port SFP/UTP M1 series modules there are no restrictions. | * When assigning interfaces to a VDC on the 48 port SFP/UTP M1 series modules there are no restrictions. | ||
* When assigning interfaces to a VDC on the 32 port 10GE M1 series modules, all four interfaces in a port group must be assigned to the same VDC. | * When assigning interfaces to a VDC on the 32 port 10GE M1 series modules, all four interfaces in a port group must be assigned to the same VDC. | ||
- | * When assigning interfaces to a VDC on the 32 port 1/10GE F1 Series module, both ports in a port group (IE. 1 | + | * When assigning interfaces to a VDC on the 32 port 1/10GE F1 Series module, both ports in a port group (IE. 1-2, 3-4, etc.) must be assigned to the same VDC. |
+ | * When assigning interfaces to a VDC on the 48 port 1/10GE F2 Series module, all four ports in a port group (IE. 1-4, 5-8, etc.) must be assigned to the same VDC. | ||
* When assigning interfaces to a VDC on a Nexus 2248TP, all interfaces must belong to the same VDC. | * When assigning interfaces to a VDC on a Nexus 2248TP, all interfaces must belong to the same VDC. | ||
* One 10 GE interface per port group can be configured in dedicated mode using the '''rate-mode dedicated''' interface CLI command on the M1 series modules (The remaining three ports are disabled). | * One 10 GE interface per port group can be configured in dedicated mode using the '''rate-mode dedicated''' interface CLI command on the M1 series modules (The remaining three ports are disabled). |
Revision as of 21:15, 1 June 2012
Objective
This tech note outlines the main differences in interface support between Cisco® NX-OS Software and Cisco IOS® Software. Sample configurations are included for Cisco NX-OS and Cisco IOS Software for some common features to demonstrate the similarities and differences. Please refer to the NX-OS documentation on Cisco.com for a complete list of supported features.
Interface Configuration Overview
The NX-OS supports different physical and virtual interface types to meet various network connectivity requirements. The different interface types include: layer-2 switched (access or trunk), layer-3 routed, layer-3 routed (sub-interface trunk), switched virtual interface (SVI), port-channel, loopback, and tunnel interfaces. Port-channel interfaces are documented in the Cisco NX-OS/IOS Port-Channel ComparisonTech-Note.
Important Cisco NX-OS and Cisco IOS Software Differences
In Cisco NX-OS:
- SVI command-line interface (CLI) configuration and verification commands are not available until you enable the SVI feature with the feature interface-vlan command.
- Tunnel interface command-line interface (CLI) configuration and verification commands are not available until you enable the Tunnel feature with the feature tunnel command.
- Interfaces support stateful and stateless restarts after a supervisor switchover for high availability.
- Only 802.1q trunks are supported, so the encapsulation command isn't necessary when configuring a layer-2 switched trunk interface. (Cisco ISL is not supported)
- An IP subnet mask can be applied using /xx or xxx.xxx.xxx.xxx notation when configuring an IP address on a layer-3 interface. The IP subnet mask is displayed as /xx in the configuration and show interface command output regardless which configuration method is used.
- The CLI syntax for specifying multiple interfaces is different in Cisco NX-OS Software. The range keyword has been omitted from the syntax (IE: interface ethernet 1/1-2)
- When monitoring interface statistics with the show interface CLI command, a configurable load-interval can be configured per interface with the load-interval counters command to specify sampling rates for bit-rate and packet-rate statistics. The Cisco IOS Software supports the load-interval interface command, but doesn't support multiple sampling rates.
- I/O modules have a locator-LED (beacon) that allows remote-hands-support personnel to easily identify a specific port. The beacon light can be enabled per interface in interface configuration mode with the beacon CLI command.
- An administrator can configure port profiles as templates that can be applied to a large number of interfaces to simplify the CLI configuration process. Port profiles are "live" configuration templates, so modifications to a port profile are automatically applied to the associated interfaces. Cisco IOS uses port macros to simplify the CLI configuration process, but unlike Port Profiles they are applied one time.
- The supervisor module out-of-band management ethernet port located on the supervisor module is configured with the interface mgmt 0 CLI command.
- The supervisor module out-of-band Connectivity Management Processor (CMP) port is configured in the NX-OS with the interface cmp module <#> CLI command. The CMP port can also be configured by attaching to the CMP using the attach cmp CLI command.
- The NX-OS support Nexus 2000 (model 2248TP) Fabric Extender (FEX) connectivity. The parent Nexus 7000 manages Nexus 2000’s software and CLI configuration, so the Nexus 7000 is a single managed entity for all connected Nexus 2000's. Nexus 2000 host ports are configured using the interface ethernet <chassis/module/port> CLI command.
- Proxy ARP is disabled on all interfaces by default.
Things You Should Know
The following list provides some additional facts about the Cisco NX-OS that should be helpful when configuring interfaces.
- An interface can only be configured in 1 VDC at a time.
- When assigning interfaces to a VDC on the 48 port SFP/UTP M1 series modules there are no restrictions.
- When assigning interfaces to a VDC on the 32 port 10GE M1 series modules, all four interfaces in a port group must be assigned to the same VDC.
- When assigning interfaces to a VDC on the 32 port 1/10GE F1 Series module, both ports in a port group (IE. 1-2, 3-4, etc.) must be assigned to the same VDC.
- When assigning interfaces to a VDC on the 48 port 1/10GE F2 Series module, all four ports in a port group (IE. 1-4, 5-8, etc.) must be assigned to the same VDC.
- When assigning interfaces to a VDC on a Nexus 2248TP, all interfaces must belong to the same VDC.
- One 10 GE interface per port group can be configured in dedicated mode using the rate-mode dedicated interface CLI command on the M1 series modules (The remaining three ports are disabled).
- The mgmt 0 port is associated to all configured VDCs allowing TELNET/SSH and IP management applications such as SNMP to access the VDC directly. All mgmt 0 ports must be configured in the same IP subnet.
- The default port type is configurable for L3 routed or L2 switched in the setup startup script. (L3 is the default port type prior to running the script)
- A layer-2 switched trunk port sends and receives traffic for all VLANs by default (This is the same as Cisco IOS Software). Use the switchport trunk allowed vlan interface CLI command to specify the VLANs allowed on the trunk.
- The clear counters interface ethernet <x/x> CLI command resets the counters for a specific interface.
- An interface configuration can be reset to its default values with the default interface <x/x> global configuration command.
- The 48 port UTP M1 series module supports Time Domain Reflectometry (TDR) cable diagnostics. All 12 ports in a port group must be shutdown prior to running the test cable-diagnostics tdr interface ethernet <x/x> CLI command. The results can be verified with the show interface ethernet <x/x> cable-diagnostics-tdr command.
Configuration Comparison
The following sample code shows configuration similarities and differences between the Cisco NX-OS and Cisco IOS Software CLIs. The CLI is very similar between Cisco IOS and Cisco NX-OS Software.
Cisco IOS CLI | Cisco NX-OS CLI | |
---|---|---|
Configuring a Routed Interface |
interface gigabitethernet 1/1
ip address 192.168.1.1 255.255.255.0 no shutdown | interface ethernet 1/1
ip address 192.168.1.1/24 no shutdown |
---|
Configuring a Switched Interface (VLAN 10) |
vlan 10
switchport switchport mode access switchport access vlan 10 no shutdown | vlan 10
switchport switchport mode access switchport access vlan 10 no shutdown |
---|
Configuring a Switched Virtual Interface (SVI) |
Cisco IOS Software does not have the ability to enable or disable SVI interfaces using the feature command.
ip address 192.168.1.1 255.255.255.0 no shutdown | feature interface-vlan
ip address 192.168.1.1./24 no shutdown |
---|
Configuring a Switched Trunk Interface |
interface GigabitEthernet 1/1
switchport switchport trunk encapsulation dot1q switchport trunk native vlan 2 switchport trunk allowed vlan 10,20 switchport mode trunk no shutdown | interface ethernet 1/1
switchport mode trunk switchport trunk allowed vlan 10,20 switchport trunk native vlan 2 no shutdown |
---|
Configuring a Routed Trunk Sub-Interface |
interface gigabitethernet 1/1
no switchport no shutdown
interface gigabitethernet1/1.10 encapsulation dot1Q 10 ip address 192.168.1.1 255.255.255.0 no shutdown | interface ethernet 1/1
no switchport no shutdown
encapsulation dot1q 10 ip address 192.168.1.1/24 no shutdown | |
---|---|---|
Configuring a Loopback Interface |
interface loopback 1
ip address 192.168.1.1 255.255.255.255 no shutdown | interface loopback 1
ip address 192.168.1.1/32 no shutdown |
---|
Configuring a Tunnel Interface |
Cisco IOS Software does not have the ability to enable or disable Tunnel interfaces using the feature command.
ip address 192.168.1.1 255.255.255.0 tunnel source 172.16.1.1 tunnel destination 172.16.2.1 no shutdown | feature tunnel
ip address 192.168.1.1/24 tunnel source 172.16.1.1 tunnel destination 172.16.2.1 no shutdown |
---|
Configuring an Interface Description | ||
interface gigabitethernet 1/1
description Test Interface | interface ethernet 1/1
description Test Interface |
---|
Configuring Jumbo Frames | ||
interface gigabitethernet 1/1
mtu 9216 | interface ethernet 1/1
mtu 9216 |
---|
Configuring Multiple Interfaces (Examples) | ||
interface range gigabitethernet 1/1-2
or interface range gigabitethernet 1/1, gigabitethernet 2/1 | interface ethernet 1/1-1
or interface ethernet 1/1, ethernet 2/1 |
---|
Configuring Port Profiles | ||
Cisco IOS Software does not have the ability to configure port profiles. | port-profile type ethernet Email-Template
switchport switchport access vlan 10 spanning-tree port type edge no shutdown description Email Server Port state enabled
inherit port-profile Email-Template |
---|
TDR Cable Diagnostics | ||
test cable-diagnostics tdr interface gigabitethernet 1/1 | test cable-diagnostics tdr interface etherent 1/1 |
---|
Configuring the Interface Locator-LED (Beacon) | ||
Cisco IOS Software does not have the ability to enable a located-led per interface. | interface ethernet 1/1
beacon |
---|
Configuring a Nexus 2000(FEX) Host Interface | |
Cisco IOS Software does not have the ability to connect a Nexus 2000(FEX). | interface ethernet 101/1/1 |
---|
Verification Command Comparison
The following table lists some useful show commands for verifying the status and troubleshooting an interface.
Cisco NX-OS Interface | Cisco IOS Software Interface | Command Description |
---|---|---|
show interface | show interface | Displays the status and statistics for all interfaces or a specific interface |
show interface ethernet <x/x/x> | - | Displays the status and statistics for a FEX host interface |
show interface ethernet <x/x> cable-diagnostics tdr | show cable-diagnostics tdr interface type <x/x> | Displays TDR test results |
show interface brief | - | Displays a brief list of the interfaces (type, mode, status, speed, MTU) |
show interface capabilities | show interface capabilities | Displays interface capabilities |
show interface counters | show interface counters | Displays interface counters (input/output unicast, multicast & broadcast) |
show interface debounce | show interface debounce | Displays the de-bounce status and time in ms for all interfaces |
show interface description | show interface description | Displays all interfaces with configured descriptions |
show interface ethernet | show interface ethernet | Displays status and statistics for a specific interface |
show interface fex-fabric | - | Displays FEX fabric interface status |
show interface flowcontrol | show interface flowcontrol | Displays Flow Control (802.1p) status and state for all interfaces |
show interface loopback | show interface loopback | Displays status and statistics for a specific loopback interface |
show interface mac-address | - | Displays all interfaces and their associated MAC Addresses |
show interface mgmt | - | Displays status and statistics for the management interface located on the supervisor |
show interface port-channel | show interface port-channel | Displays status and statistics for a specific port-channel |
show interface priority-flow-control | - | Displays PFC information |
show interface pruning | show interface pruning | Displays trunk interfaces VTP pruning information |
show interface snmp-ifindex | - | Displays SNMP interface index |
show interface status | show interface status | Displays all interfaces and their current status |
show interface switchport | show interface switchport | Displays a list of all interfaces that are configured as switchports |
show interface transceiver | show interface transceiver | Displays a list of all interfaces and optic information (calibrations, details) |
show interface trunk | show interface trunk | Displays a list of all interfaces configured as trunks |
show interface tunnel <#> | show interface tunnel <#> | Displays status and statistics for a specific tunnel interface |
show interface vlan <#> | show interface vlan <#> | Displays status and statistics for a specific VLAN interface |
- | - | - |
show port-profile | - | Displays all port profile information |
show port-profile brief | - | Displays brief port profile information |
show port-profile expand-interface | - | Displays active profile configuration applied to an interface |
show port-profile name | - | Displays specific port profile |
show port-profile sync-status | - | Displays interfaces out of sync with port profiles |
show port-profile usage | - | Displays interfaces inherited to a port profile |