Cisco Support Community Expert Series Webcast:
Vishal Mehta Customer Support TAC Engineer
February 19, 2014
Troubleshooting Common Features of UCS and Nexus 1000v
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• Today’s featured expert is Cisco Support TAC Engineer Vishal Mehta
• Ask him questions now about UCS and Nexus 1000v
Vishal Mehta
Customer Support TAC Engineer
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Panel of Experts
February 19, 2014
Ali Haider
Customer Support
Engineer
Gunjan Patel
Customer Support
Engineer
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Today’s presentation will include audience polling questions
We encourage you to participate!
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If you would like a copy of the presentation slides, click the PDF link in the chat box on the right or go to:
https://supportforums.cisco.com/community/netpro/data-center
Or, https://supportforums.cisco.com/docs/DOC-40057
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Do you have Nexus 1000v installed on a UCS environment?
a) I have UCS but no Nexus 1000v on it
b) I have Nexus 1000v but not on UCS
c) I am planning to have Nexus 1000v on UCS
d) I am using Nexus 1000v with UCS
Use the Q & A panel to submit your questions and panel of experts will respond.
Troubleshooting Common Features of UCS and Nexus 1000v
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UCS – End Host Mode
Nexus 1000v
Compatibility
Configurations
Port-Channeling
Quality of Service
Private VLAN
MAC Trace
Multicast
MS-NLB
Traffic Flow
TAC Cases
Q & A
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Cisco recommends End-host Mode
No Spanning Tree Protocol
Reduces CPU load on upstream switches
Simplified upstream connectivity
UCS connects to the LAN like a Server, not like a Switch
Maintains MAC table for Southbound servers only
Prevents Loops by preventing Uplink-to-Uplink switching
Southbound traffic on same VLAN switched locally
Active/Active for Data Traffic and Active/Standby for Control Traffic
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Traffic received from servers going to unknown destination, send it out on a pinned uplink
Unicast traffic from an uplink going to unknown destination then just drop the traffic
Consider only broadcasts received from servers or on designated broadcast uplinks
Broadcast traffic received on designated Broadcast Link that originated from one of its own servers, then just drop the traffic
Broadcast traffic received on designated Broadcast Link is flooded to all the servers and its not passed onto the uplinks
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Server to server traffic on the same VLAN is locally switched
Uplink port to Uplink port traffic not switched
Each server link is pinned to an uplink port / port-channel
Network to server unicast traffic is forwarded to the server only if it arrives on pinned uplink port. This is termed as the Reverse Path Forwarding – (RPF) check
Packet with source MAC belonging to a server received on an uplink port is dropped (Deja-Vu Check)
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Broadcast traffic is pinned on exactly one uplink port (or port-channel) i.e., it is dropped when received on other uplinks (Designated Receiver)
All multicast groups are pinned to same uplink port (port-channel)
Server to server multicast traffic is locally switched
RPF & deja-vu check also applies for multicast traffic
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N1k VSM is for control plane functions only & is not in path of data traffic
If Nexus 1010 or VSM goes down, it does not disrupt existing traffic from VMs on VEM, VEM continues to operate in headless mode, but new traffic & vMotion will FAIL
Nexus 1000v has no knowledge of FCoE
Layer 3 is recommended mode for VSM-VEM connectivity
N1k does not participate in Spanning-Tree
LACP negotiations are offloaded to VEM from VSM
Do not configure a dynamic vNIC policy for ESXi host service profiles VSM-VEM wont work
Do not enable fabric failover on the adapters in UCSM service profiles when using Nexus 1000v
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NTP Time synchronization across VEMs is a must
L3 mode uses UDP port 4785 for both source and destination (make sure that is not blocked in ACL/FW)
Don’t use VMware snapshots to take backup on VSM – Not Supported and causes Flapping of VEM
Using all switches – vSwitch, vDS and Nexus1000v ? – make sure cabling is correct (for C-series servers)
You can use same VLAN for control/packet/management (avoid VLAN 1)
Ensure control, management and packet VLANs are allowed in upstream devices
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Used for critical communication
Bad for security reasons
Brings port online faster
Ports get straight access to the kernel even if the DVS is not up
Once a system profile is in use by at least one interface
Can add to the list of system VLANs
Cannot delete any VLANs from the list
Must be used for
Management VLAN
Storage VLAN (iSCSI/ NFS)
For L2 – make sure control VLAN is a system
For L3 – make sure vmk port-profile set with system VLAN
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port-profile type ethernet UPLINK
vmware port-group
switchport mode trunk
switchport trunk allowed vlan 10,18,19,25,90
channel-group auto mode on mac-pinning
no shutdown
system vlan 18,25,90
state enabled
port-profile type vethernet Layer3
capability l3control
vmware port-group
switchport mode access
switchport access vlan 25
no shutdown
system vlan 25
max-ports 1024
state enabled
port-profile type vethernet VAPP
vmware port-group
switchport mode access
switchport access vlan 90
no shutdown
system vlan 90
max-ports 1024
state enabled
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L2 mode • Needs L2 connectivity
• VSM uses BOTH Control and Packet vNICS
• Ctrl & pkt VLAN MUST be present in the
each segment of the data path
• More broadcasts
L3 mode • VEM-VSM should have L3 Connectivity (ping)
• VSM uses either mgmt0 or ctrl0 for control
• Requires a vmk in the VEM for encapsulation
• VSMs (active-standby) still require L2
• Less broadcasts
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Can the same N1KV manage both ESXi & Hyper-V?
Answer: No. Separate N1KV switches should be deployed for different hypervisor
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When upgrading Nexus 1000v & VMware infrastructure, follow below tool for procedure
http://www.cisco.com/web/techdoc/n1kv/upgrade/utility/n1kvmatrix.html
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Prior to any firmware upgrades or installation refer to below tool for UCS
http://www.cisco.com/web/techdoc/ucs/interoperability/matrix/matrix.html
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Always upgrade drivers after UCS firmware upgrade
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Do you find configuring these common features of UCS & Nexus1000v to be a complicated task?
a) Yes, I do
b) No, I do not
c) I’m not sure
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Check below links for new configuration and troubleshooting documents
www.cisco.com/go/ucs
www.cisco.com/go/nexus1000v
MAC Trace
http://www.cisco.com/en/US/products/ps10477/products_tech_note09186a0080c17094.shtml
L2 Multicast
http://www.cisco.com/en/US/partner/products/ps10477/products_configuration_example09186a0080c20af4.shtml
Private VLAN
http://www.cisco.com/en/US/products/ps10280/products_configuration_example09186a0080c1e923.shtml
More externalization from Cisco TAC on its way
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N1k on UCS-C series – use LACP
When connecting to upstream switches with multiple uplinks or vPC/VSS
Supports up to 16 physical links in the bundle
LACP uses native vlan for PDU exchange
Check for LACP counters on Upstream Switch
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N1k on UCS-B series – use MAC-Pinning
MAC-Pinning is only supported port-channeling option for N1k and UCS-B
No “port-channel” configuration needed on upstream switches
Used when upstream switches cannot be clustered using vPC or VSS
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UCS Global QoS
Only CoS Values 0-6 can be assigned. CoS 7 is reserved for Control
6 class of traffic – Platinum, Gold, Silver, Bronze, Best Effort & Fibre Ch.
The only required classes are Best Effort & Fibre Channel (default)
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UCS QoS – vNIC
Cisco VIC card by default will overwrite the CoS value set by the host
Select Full Host Control to trust the markings done by the host / software switch, like Nexus 1000v
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QoS policy applied to the vNIC of the adapter
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Nexus 1000v QoS Basics
N1k has 8 pre-defined traffic protocol classes
Per VEM, only 16 classes of traffic (8 CoS values & 8 Traffic Protocols)
The sum of bandwidth percentages for all classes in a policy-map should equal 100
Infrastructure traffic (such as vMotion, VMware Mgmt & N1k Control/Mgmt/Packet) should always have bandwidth reserved for times of congestion
If the N1k Control/Mgmt/Packet traffic does not have the proper resources allocated, VEM-to-VSM communications can suffer during congestion
Traffic
Protocol
N1k Control
N1k Packet
N1k Mgmt
vMotion
VMware
Mgmt
FT Logging
NFS
Storage
iSCSI
Storage
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Nexus 1000v CBWFQ
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Nexus 1000v Configuration
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Nexus 1000v Verification
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Following are important points to remember for PVLAN in UCS-N1k setup
Only Isolated Ports are supported in UCS
With N1k installed – Community VLANs can be used but promiscuous port must be on N1k
A server vNIC cannot carry both regular & isolated VLANs
No support for Promiscuous Ports/Trunks, Community Ports/Trunks or Isolated Trunks
Promiscuous ports need to be outside of the UCS domain
A vNIC can only have one Isolated VLAN
For Bare Metal OS (Windows/Linux) – create vNIC with Isolated VLAN and set as native VLAN
For ESXi – Separate vNIC needs to be created just to carry the Isolated VLAN
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Link below explains all possible configurable options for Private VLAN on UCS and Nexus 1000v
http://www.cisco.com/en/US/products/ps10280/products_configuration_example09186a0080c1e923.shtml
Isolated PVLAN with promiscuous port on an upstream device
Isolated PVLAN on N1K with promiscuous port on an upstream device
Isolated PVLAN on N1K with promiscuous port on N1K uplink port−profile
Community PVLAN on N1K with promiscuous port on N1K uplink port−profile
Isolated PVLAN on VMware DVS with promiscuous port on the DVS.
Community PVLAN on VMware DVS switch with promiscuous port on the DVS
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http://www.cisco.com/en/US/products/ps10477/products_tech_note09186a0080c17094.shtml
MAC:A MAC:B
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IGMP snooping allows a Layer 2 switch to dynamically determine which hosts connected to a particular VLAN in the switch need to receive a particular multicast transmission. This is done by snooping or listening & inspecting IGMP membership reports
In the absence of an upstream multicast router, enabling IGMP snooping querier allows a Layer 2 switch to send IGMP queries to the host (in place of the Multicast Router) so that the multicast membership is kept up-to-date on the switch
The aim of UCS release 2.1 is to provide this flexibility in configuring/modifying
IGMP snooping
IGMP querier
IGMP Snooping configuration is only available and configurable on a per VLAN basis. You cannot enable/disable IGMP Snooping globally
Disabling of IGMP snooping is supported in both End Host Mode (EHM) and Switch Mode
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L2 Multicast configuration on UCS, Nexus 5000 and Nexus 1000v at below link:
http://www.cisco.com/en/US/partner/products/ps10477/products_configuration_example09186a0080c20af4.shtml
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UCS supports all 3 modes of MS-NLB – Unicast, Multicast, Multicast+IGMP
Configuration requirements if NLB is Multicast or Multicast IGMP:
Static ARP entries with the Virtual NLB IP & MAC Address on edge router
An IGMP Querier in the environment for Multicast to work (Multicast+IGMP)
Static multicast MAC entries on all the upstream switches in the local segment that needs to communicate with the NLB IPs (Multicast mode without IGMP)
IGMP Snooping needs to be enabled on all switches, including UCS (Multicast+IGMP)
Traffic behavior with MS NLB:
The source MAC on traffic outbound from the NLB nodes is unicast always
The destination MAC on traffic outbound from the NLB nodes is unicast always
In IGMP/Multicast mode, the destination MAC on traffic inbound to NLB is multicast
In Unicast mode, the destination MAC on traffic inbound to NLB is unicast
N1k supports only Unicast Mode from version 4.2(1)SV1(5.1) onwards
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Configuration on Cisco Layer 2 Switches for MS-NLB
www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a0080a07203.shtml - IOS 6500
http://www.cisco.com/en/US/tech/tk828/technologies_configuration_example09186a0080c13ba0.shtml - Nexus 7000
MS-NLB with VMware
http://deinoscloud.wordpress.com/2010/02/10/microsoft-network-load-balancing-nlb-on-vmware-esx/
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006778
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1556
Cisco Forums on UCS
https://supportforums.cisco.com/thread/2112862
https://communities.cisco.com/message/109945
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How often do you contact TAC for UCS-N1k troubleshooting?
a) I work with TAC on a regular basis
b) I sometimes contact TAC
c) I rarely contact TAC
d) I have never worked with TAC
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Setup:
vMotion across FI via N7k fails or extremely slow
vMotion traffic switched locally within same FI works smoothly
vMotion traffic from UCS is tagged with CoS value 2
Default QoS setting on N7k was changed
N7k interface output discards increments during vMotion
CoS 1 & 2 were not mapped to any class-maps on N7k
This was causing packets with CoS 1 & 2 to be dropped
FIX:
class-map type queuing match-any 1p7q4t-out-q-default
match cos 1-2, 6
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Customer Network has VLAN ID 8 as Native VLAN
All Management IP addresses including that of ESXi are on native VLAN
After changing Native VLAN to 100 – cannot ping the ESXi Management
Need to change ESXi settings as shown below:
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With bare metal installation of an OS (Windows/Linux) on a UCS blade, take into consideration the fact that UCS vethernet ports are always trunk interfaces
To essentially make a vNIC into an "access" port, configure one VLAN per vNIC, with the Native VLAN checkbox checked so that packets sent across that trunk are untagged
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Problem: Orlando hosts (VEM) can be added into N1k but not those in San Jose.
Errors:
1. vCenter reports “Operation timeout” when trying to add VEMs to VSM
2. Following error on VSM 2013 Mar 10 15:31:15.875 N1k-ORL VMS-5-DVS_HOSTMEMBER_INFO A host with name= [CiscoLive.a.sanjos.ca] & uuid=[789abc3d-1234-45ab-9b56-1w123456789f] is added to the dvs. The host is not found as a module in the VSM configuration.
Issue: VEM MAC address was not getting learned on upstream switches
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Troubleshooting:
1. Initially suspected long distance between Data Centers
2. Checked VSM-vCenter connectivity – healthy connection
3. Checked opaque data on VSM and VEM is consistent
4. Verified the configuration across Data Centers devices – UCS, N7k, N1k
5. Checked if VSM & VEM MAC addresses are learned on upstream switches for
the control VLAN
Solution:
Broadcast from VEMs on San Jose Site were not getting programmed correctly on
the Fabric Path interfaces of Chicago site
VEM MAC not learned on 4948 switch in Orlando
Issue on Nexus 7000 fabric-path port
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Make sure it is defined in UCS
Defined & allowed on upstream switches
Added into vNIC of service profile
Defined on N1k
Allowed on port-profile of vEths on N1k
Case: Cannot add all the VEMs (from same UCS chassis) to VSM
Symptom: on vCenter – it shows hosts being added to N1k. however, same host not found under ‘show module’, hosts appears on ‘show module vem missing’
Solution: The 3 VEMs which were having issues were un-bounded from service profile template and vNIC had missing VLANs, one of them being control VLAN
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VMs cannot ping Default Gateway:
Is Default Gateway a Firewall? Check the settings
Check the IP subnet & mask
ARP Failing – Proxy ARP?
Firewall responding with its own MAC address instead that of the blades?
Disable proxy-arp on ASA example:
http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/route_overview.html#wp1106863
Troubleshooting Tip:
Create SVI (interface-vlan) on Upstream Switch in same vlan and try to ping both VM & Default Gateway. This helps to narrow down the scope of the problem.
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When you install ESXi, vmk0 gets assigned the MAC address of the first NIC in the server
This is not a problem in traditional server environments where the MAC address is burnt into the NIC
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How it happens in UCS ?
Existing Service Profile MAC Addresses:
vNIC0 MAC address of 00:25:B5:00:00:0E
vNIC1 MAC address of 00:25:B5:00:00:0F
Install ESXi on the blade & MAC address of vmk0 is now 00:25:B5:00:00:0E
Later move new SP to blade with following MAC Addresses:
vNIC0 MAC address of 00:25:B5:00:00:0A vNIC1 MAC address of 00:25:B5:00:00:0B
Even though the original server has new mac address for its vNICs, vmk0's MAC is still 00:25:B5:00:00:0E
Duplicate MAC address has now been introduced
This can cause an issue with intermittent connectivity and loss of around 30-40% of ping packets
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1031111
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Best Practice:
1. For bare metal installations of OS (Microsoft, RHEL, SUSE) we suggest using fabric failover and no teaming in the OS. This saves loading drivers & extra configuration on the OS side
2. For VMware hypervisor with UCS running 1.4 or newer, we suggest not to use fabric failover vSwitch or DVS or N1k will automatically load balance & failover
3. For Microsoft hypervisor with UCS running 1.4 or newer, we suggest using fabric failover
4. With iSCSI, vNICs should not use Failover feature as the best practice is to use host-based multi-pathing drivers for all load balancing & failure handling
Recommendation:
Design for redundancy by using vNIC Failover or NIC teaming/bonding, but never both
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Does Adapter support it ?
http://www.cisco.com/en/US/products/ps10277/prod_models_comparison.html#~tab-a
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Error on UCSM
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To complete the evaluation, please click on link provided in the chat or in the pop-up once the event is closed.
Those who fill out the Evaluation Survey will enter a raffle to win:
Cisco Press eBook
(value up to $80 USD)
If you have additional questions, you can ask Vishal. He will be answering from February 19 through February 28, 2014.
https://supportforums.cisco.com/thread/2266418
You can catch the video or read the Q&A five business days after the event at
https://supportforums.cisco.com/community/netpro/ask-the-expert/webcasts
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A. The UCS system was implemented at the billion dollar Epic Game’s company to assist in production of some of the top selling video games for the Xbox 360, iPad, iPhone and iPod.
B. The UCS and Nexus 1000v system was implemented in the making of the new motion picture “Need for Speed” based on the famous video game series.
C. Electronic Arts used the UCS and Nexus 1000v in assisting with the infrastructure necessary to produce the new FIFA 14 game.
What do UCS and video games have in common?
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Topic: IOS-XR: Installing and Upgrading Software and Introduction to Cisco Software Manager
Tuesday, February 25
9:00 a.m. Mexico City
10:30 a.m. Caracas
12:00 p.m. Buenos Aires
5:00 p.m. Madrid
Join Cisco Expert:
Sergio Barragan
During this live event, Sergio will present Turboboot methods, CLI installation and IOS SR system upgrade.
Registration for this live webcast:
http://tools.cisco.com/gems/cust/customerSite.do?METHOD=E&LANGUAGE_ID=S&SEMINAR_CODE=S19871&PRIORITY_CODE
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Topic: OSPF Introduction Tuesday, March 4
10:00 a.m. JST Tokyo
or
Monday, March 3
5:00 p.m. San Francisco
Join Cisco Expert:
Tsuyoshi Suzuki
During this live event, Tsuyoshi will provide an overview of OSPF, how it works, terminologies and features to learn, and noteworthy points needed to learn when pursuing CCNA certification..
Registration for this live webcast:
http://tools.cisco.com/gems/cust/customerSite.do?METHOD=E&LANGUAGE_ID=J&SEMINAR_CODE=S19864&PRIORITY_CODE
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Topic: Deploying and Troubleshooting Cisco Unified Contact Center Express Scripts
Tuesday, March 18
12:00 p.m. Moscow Time
9:00 a.m. Brussels Time
Join Cisco Expert:
Sergey Oliferov
During this live event, Sergey Oliferov discuss how to deploy and troubleshoot scripts for Cisco Unified Contact Center Express.
Registration for this live webcast:
http://tools.cisco.com/gems/cust/customerSite.do?METHOD=E&LANGUAGE_ID=R&SEMINAR_CODE=S19966&PRIORITY_CODE=
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Topic: Enterprise IPv6 Deployment
Join Cisco Expert: Chip Nielsen Learn and ask questions about enterprise IPv6 deployment.
Ends February 28
Join the discussion for these Ask The Expert Events:
https://supportforums.cisco.com/community/netpro/expert-corner#view=ask-the-experts
Topic: Cisco Unified Communications Manager (CUCM) Version 10.0
Join Cisco Experts: Raees Shaikh & Amit Singh Learn and ask questions install, upgrade requirements along with call routing enhancements of Cisco Unified Communications Manager (CUCM) Version 10.0.
Ends February 28
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Topic: FSPF Concept and Troubleshooting in Cisco SAN Environment
Join Cisco Expert: Upinder Sujlana Learn and ask questions about FSPF, VSAN interaction, load balancing and troubleshooting.
Starts March 3
Topic: SP Mobility
Join Cisco Expert: Rahul Pal, Arpit Menaria & Krishna Kishore D. V. Learn and ask questions about SP Mobility
Starts March 3
Join the discussion for these Ask The Expert Events at:
https://supportforums.cisco.com/community/netpro/expert-corner#view=ask-the-experts
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Topic: Latest Release of Cisco Unified Computing System
Manager (UCSM) 2.2
Thursday, February 27, 2014
3:30AM – 6:00PM San Clara, CA
Join Cisco Experts:
Krishna Sivakumar, Product Manager, Cisco
Sameh Zakhary, Product Manager, Cisco
Jason Shaw, Technical Marketing Engineer, Cisco
Join Cisco UCS Product managers and other data center management experts for a discussion on the UCS Manager 2.2 Release. We will raffle out one Beats by Dr. Dre earphones, at the end of the demo. You will have a chance to win Cisco Polo T-shirt by answering questions on site.
RSVP at:
http://www.meetup.com/csc-sv/events/162154302/
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Topic: Working with Compliance Management and Configuration
Services (CMCS)
Thursday, March 13, 2014
12:00PM – 2:00PM San Clara, CA
Join Cisco Expert:
Mark Doering, Technical Marketing Engineer, Cisco
Join us to learn how Cisco Compliance Management and Configuration Service (CMCS) can help you to proactively manage regulatory, commercial and organization compliance. Lunch will be provided.
RSVP at:
http://www.meetup.com/csc-sv/events/160605382/
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Global community members can collaborate with colleagues and other support professionals with easy, on-the-go access to the community’s breadth of technical resources in their local language.
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A. The UCS system was implemented at the billion dollar Epic Game’s company to assist in production of some of the top selling video games for the Xbox 360 and iPad, iPhone and iPod.
B. The UCS and Nexus 1000v system was implemented in the making of the new motion picture “Need for Speed” based on the famous video game series.
C. Electronic Arts used the UCS and Nexus 1000v in assisting with the infrastructure necessary to produce the new FIFA 14 game.
For the Gears of War 3 launch, we boosted both our web presence and online forums for the growing number of fans and users. With Cisco UCS, we’re able to spin up new virtual machines on demand”. Under the old environment, Nilsson’s team would need two to three days to get a new physical server provisioned. “Today, I can get a new virtual machine up in minutes.” In addition to speedy, consistent, no-touch provisioning, Epic Games also benefits from a sharp decrease in operation costs with Cisco UCS.
What does UCS and video games have in common?
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