1. What is the command is used to verify the “HSRP Active State” on a Nexus 7000 Series Switch?
2. On a Nexus 7018, when trying to perform a ‘no shut’ on Ethernet 1/3, the ERROR: Ethernet1/3: Config not allowed, as first port in the port-grp is dedicated error message is received.
The device thinks that the first port in the port-grp is in dedicated mode instead of shared mode. When the first port of a port-grp is in dedicated mode, the other ports of the port-grp cannot be used. .
Virtual PortChannel (vPC) is a port-channeling concept that extends link aggregation to two separate physical switches. Benefits of vPC include: Utilizes all available uplink bandwidth Allows the creation of resilient Layer 2 topologies based on link aggregation Eliminates the dependence of Spanning Tree Protocol in Layer 2 access distribution layer(s) Enables transparent server mobility and server high availability (HA) clusters Scales available Layer 2 bandwidth Simplifies network design Dual-homed servers can operate in active-active mode Faster convergence upon link failure Improves convergence time when a single device fails Reduces capex and opex nexus-7k-faq-01.gif
Nexus 7000 has a loop prevention method that drops traffic traversing the peer link (destined for a vPC peer link) when there are no failed vPC ports or links. The rule is simple: if the packet crosses the vPC peer link, it may not go out any port in a vPC even if that vPC does not have the original VLAN.
5. How do I verify the features enabled on Nexus 7000 Series Switch with NX-OS 4.2?
Issue the show feature command in order to verify. switch-N7K# show feature Feature Name Instance State ——————– ——– ——– tacacs 1 enabled scheduler 1 enabled isis 2 disabled isis 3 disabled isis 4 disabled ospf 1 enabled ospf 2 disabled ospf 3 disabled
6. Is there a tool available for configuration conversion on Cisco 6500 series to the Nexus platform?
Cisco has developed the IOS-NXOS Migration Tool for quick configuration conversion on Cisco 6500 series to the Nexus series OS.
8. Is Nexus 7010vPC feature (LACP enabled) compatible with the Cisco ASA etherchannel feature and with ACE 4710 etherchannel?
With respect to vPC, any device that runs the LACP (which is a standard), is compatible with the Nexus 7000, including ASA/ACE.
Orphan ports are single attached devices that are not connected via a vPC, but still carry vPC VLANs. In the instance of a peer-link shut or restoration, an orphan port’s connectivity may be bound to the vPC failure or restoration process. Issue the show vpc orphan-ports command in order to identify the impacted VLANs.
The Cisco Nexus 7000 Series 32-Port 1 and 10 Gigabit Ethernet Module support FCoE. The part number of the product is N7K-F132XP-15.
12. What is the minimum NX-OS release required to support FCoE in the Nexus 7000 Series Switches?
FCoE is supported on Cisco Nexus 7000 Series systems running Cisco NX-OS Release 5.2 or later.
On a Nexus, use a route-map command with a set clause of metric-type type-[½] in order to have the same functionality as in IOS using the default-information originate always metric-type [½] command. For example: switch(config)#route-map STAT-OSPF, permit, sequence 10 switch(config-route-map)#match interface ethernet 1/2 switch(config-route-map)#set metric-type {external | internal | type-1 | type-2}
14. How do I redistribute connected routes into an OSPF instance on a Nexus 7010 with a defined metric?
In NX-OS, a route-map is always required when redistributing routes into an OSPF instance, and you will also use this route-map to set the metric. Further, subnet redistribution is by default, so you do not have to add the subnets keyword. For example: switch(config)#access-list 101 permit ip
15. What is the equivalent NX-OS command for the “ip multicast-routing” IOS command, and does the Nexus 7000 support PIM-Sparse mode?
The command is feature pim. In NX-OS, multicast is enabled only after enabling the PIM or PIM6 feature on each router and then enabling PIM or PIM6 sparse mode on each interface that you want to participate in multicast. For example:
switch(config)#feature pim switch(config)#interface Vlan[536]switch(config-if)#ip pim sparse-mode See Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide, Release 5.x for a complete configuration guide.
16. When I issue the “show ip route bgp” command, I see my routes being learned via OSPF and BGP. How can I verify on the NX-OS which one will always be used and which one is a backup?
Here is what is received: Nexus_7010#show ip route bgp IP Route Table for VRF “default” ‘*’ denotes best ucast next-hop ‘**’ denotes best mcast next-hop ‘[x/y]’ denotes [preference/metric]
172.20.62.0/23, ubest/mbest: 1/0 *via 10.194.160.2, [20/0], 18:53:35, bgp-[AS-Number], internal, tag [Number]via 10.194.16.5, Vlan116, [110/1043], 18:43:51, ospf-1, intra 172.20.122.0/23, ubest/mbest: 1/0 *via 10.194.160.2, [20/0], 18:53:35, bgp-[AS-Number], internal, tag [Number]via 10.194.16.5, Vlan116, [110/1041], 18:43:51, ospf-1, intra By default, BGP selects only a single best path and does not perform load balancing. As a result, the route marked with the * will always be used, unless it goes down, at which point any remaining routes will become the preferred path.
17. How do I avoid receiving the “Failed to process kickstart . Pre-Upgrade check failed” error message when upgrading the on a Nexus 7000 Series Switch?
One potential reason for receiving this error message is if the file name specified is not correct. For example: switch#install all kickstart bootflash:n7000-sl-kickstart.5.1.1a.bin system bootflash:n7000-sl-dk9.5.1.1a.bin In this example, the file name contains “sl” (lowercase letter l) instead of “s1” (number 1).
18. How can I avoid receiving the “Configuration does not match the port capability” error message when enabling “switchport mode fex-fabric”?
N7K-2(config)#interface ethernet 9/5 N7K-2(config-if)#switchport mode fex-fabric ERROR: Ethernet9/5: Configuration does not match the port capability In order to resolve this problem, check the port capabilities by using the show interface ethernet command. For example: N7K-2#show interface ethernet 9/5 capabilities Ethernet9/5 Model: N7K-M132XP-12 Type (SFP capable): 10Gbase-(unknown) Speed: 10000 Duplex: full Trunk encap. type: 802.1Q Channel: yes Broadcast suppression: percentage(0-100) Flowcontrol: rx-(off/on),tx-(off/on) Rate mode: shared QOS scheduling: rx-(8q2t),tx-(1p7q4t) CoS rewrite: yes ToS rewrite: yes SPAN: yes UDLD: yes Link Debounce: yes Link Debounce Time: yes MDIX: no Pvlan Trunk capable: no Port Group Members: 1,3,5,7 TDR capable: no FabricPath capable: no Port mode: Routed,Switched FEX Fabric: no dot1Q-tunnel mode: yes From this output of the show interface ethernet 9/5 capabilities command, you can see FEX Fabric: no. This verifies that the port is not FEX capable. In order to resolve this problem, upgrade the EPLD s to Cisco NX-OS Release 5.1(1) or later.
19. When I issue the “show interface counters errors” command, I see that one of the interfaces is consistently posting errors. What are the FCS-Err and Rcv-Err in the output of the “show interface counters errors” command?
—————————————————————————- Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards —————————————————————————- Eth1/1 0 26 0 26 0 0 With FCS-Err and Rcv-Err, it is usually an indication that you are receiving corrupt packets.
20. How do I enable/disable logging link status per port basis on a Nexus 7000 Series Switch?
All interface link status (up/down) messages are logged by default. Link status events can be configured globally or per interface. The interfacecommand enables link status logging messages for a specific interface. For example: N7k(config)#interface ethernet x/x N7k(config-if)#logging event port link-status
21. How do I check the Network Time Protocol (NTP) status on a Nexus 7000 Series Switch?
In order to display the status of the NTP peers, issue the show ntp peer-status command: switch#show ntp peer-status
Issue the tac-pac bootflash://
23. Can a Nexus 7000 be a DHCP server and can it relay DHCP requests to different DHCP servers per VLAN?
The Nexus 7000 does not support a DHCP server, but it does support DHCP relay. For relay, use the ip dhcp relay address x.x.x.x interface command. See Cisco Nexus 7000 Series NX-OS Security Configuration Guide, Release 5.x for more information on Dynamic Host Configuration Protocol (DHCP) on a Cisco NX-OS device.
24. How do I implement VTP in a Nexus 7000 Series Switch where VLANs are manually configured?
Cisco does not recommend running VTP in data centers. If someone attaches a switch to the network with a higher revision number without changing the VTP mode from the server, it will override the VLAN configuration on the switch.
25. Is there a best practice for port-channel load balancing between Nexus 1000V Series and Nexus 7000 Series Switches?
There is no recommended best practice for load-balancing between the Nexus 1000V Series and Nexus 7000 Series Switches. You can choose either a flow-based or a source-based model depending on the network’s requirement.
26. During Nexus 7010 upgrade from 5.2.1 to 5.2.3 code, the X-bar module in slot 4 keeps powering off. The %MODULE-2-XBAR_DIAG_FAIL: Xbar 4 reported failure due to Module asic(s) reported sync loss (DevErr is LinkNum). Trying to Resync in device 88 (device error 0x0) error message is received.
This error message corresponds to diagnostic failures on module 2. It could be a bad connection to the X-bar from the linecard, which is results in the linecard being unable to sync. Typically with these errors, the first step is to reseat the module. If that does not resolve the problem, reseat the fabric as well as the module individually.
CISCO NEXUS Interview Questions and Answers | Basics of Nexus Switches |
Cisco Nexus Interview Questions and Answers
Here are the top 15 Cisco nexus interview questions. Due to popular demands, we at PyNet Labs have decided to separate these questions into two groups.
Nexus vPC Interview Questions and Answers
Answer – Virtual Port-Channel (vPC) is a multi-chassis port channel in a feature in Cisco Nexus Switches with which we can logically bundle the links of two different chassis. It is similar to VSS, but the main difference is that vPC logically bundles the links. In contrast, VSS creates a single logical switch with one logical control plane for management and configuration.
We need to configure and manage VPC on both switches independently.
Benefits of vPC:
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Iris recognition biometric technology identifies the unique patterns of the iris (the coloured ring around the pupil of the eye). The technology reads each of the 266 unique characteristics in the human iris. It is safe, secure and non-invasive.
Nexus Interview Questions and Answers Vol 0
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