Trunking on Server NIC

As Dell and Sun provide PCI-x or PCI-e only, with just 2 build-in NICs, while server admins are quite reluctant to add additional NIC to run in traditional way, like Front-end NIC, Backup NIC, Load-Balancing-NIC, Mgmt NIC cause the PCI-x or PCI-e are quite expensive, not sure you encounter such issue or not, and how would you like deal with such issue and cater server's requirement, because we are quite reluctant to offer 802.1q trunk to server NIC either in our data center where we have hundreds of servers which are sitting behind FWSM(s). thanks.
Best Regards.
Leo

From a networking perspective, there is not too much difference between trunking and adding additional adapters in hardware.
With more adapters in a server it also becomes more complex to control routing.
A more preferrable method (at least in my opinion) is to assign the servers into relatively small VLANs. These VLANs can be set up for servers belonging to the same customer or (load)sharing the same application.
With smaller vlans you are able to use a single or teamed adapter for all traffic flows and you are still unlikely to run into network-load issues.
Regards,
Leo

Similar Messages

CVP Server NIC is down automatically in peak time

Hi All,
We have IPCC Setup with IPCC 7.5 and CVP 7.0.
We have two CVP physical servers (co-resident with Call Server, VXML Server, Media server)
And call flows work via H323 protocol (not using SIP).
Load balanced via CSS, Call Routing VIA gatekeeper (ras)
We have noticed that in peak time any one of the CVP server NIC card goes down and come back automatically after few minutes.
Any one knows about any bug in CVP 7.0 or any design issue.
please help us resolve this issue.
with Regards,
Manivannan

That command should return nothing - you have TCP offload enabled. You need to disable those things. This is the cause of instability. There are plenty of references on the Internet about disabling TCP Offload.
You can do it on the adapter out of the Windows configuration for the Network.
If it is an HP DL380 in disguise (MCS-7845-H-x) , you can also do it from the HP Network Utility, which is easier to use and you can ensure that the TCP Offload Engine is turned off. Is it an HP box?
If it is, fire up the utility and tell me if LAN Teaming is engaged across the two NICs. Maybe you know - do you have two CAT5 connections?
Regards,
Geoff

Configure trunk on a NIC

Hi,
I kind of stuck with this problem.
And I just wante dto know if there is a way to do what i want.
Is there a way to configure trunk on one NIC , the other side will be a cisco switch configure with trunk too??
I want to create on the machine several "vlan interfaces" each for each vlan inside my lab.
Each interface will have a valid IP address.
Can i reach thos address if I will cinfigure trunk on the machine and trunk on the switch???
I hope I wrote my question clearly.
Thanks!

tprizler wrote:
No no no no....
What you have mentioned is aggregation. expanding the link bandwidth using more then one port.
Trunking means , link that can contain 1 or more vlans.In cisco-speak, that's correct. However Sun sold a link-aggregation product as "SunTrunking" for many years (still does), so a great many Solaris admins will use "trunking" as a term for the aggregation concepts.
For example. If i have 2 switches connected to each other via trunk port , they can exchange trafic of several vlans on the same port.
I want to so it when i have switch at one side and a solaris machine on the other..Depends on your hardware and OS. Most interfaces are not 802.1q compliant. What interfaces/hardware do you have?
Most of the solaris docs will reference "VLAN" as a term rather than "trunking". As an example:
http://docs.sun.com/app/docs/doc/816-4554/fpden?l=en
Darren

Intel Server NIC I350 LACP IEEE802.3ad teaming issue

Hello Community
I face an issue which i cannot resolve.
I have:
Intel Server System R1208GL4DS with buildin I350 4 ports inet adapter
OS: Windows Server 2008 R2
NIC drivers ver 18.4 (PRO set with ANS)
Data Center provides ieee802.3ad dynamic aggregation teaming connection, It uses 2 ports on my server (0 and 3)
DC uses Cisco Nexus switches
SpanningTreeProtocol is ON and cannot be switched off by DC.
Problem:
One of the adapters suddenly goes on standby state and doesnot pass traffic.
As the result the whole connectivity to server and to services I use stuck at that moment.
There is only one way to resolve is to restart server or restart whole team by changing the team properties.
Nic properties:
flow control off
ofloads off
rss off
Team:
I have tried to change everything playing with any property within nic or team. No luck.
Some information from DC support of the swith config:
# sh interface po1113 switchport
Name: port-channel11
13
Switchport: Enabled
Switchport Monitor: Not enabled
Operational Mode: trunk
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Allowed: 300,390,398-399
Voice VLAN: none
Extended Trust State : not trusted [COS = 0]
Administrative private-vlan primary host-association: none
Administrative private-vlan secondary host-association: none
Administrative private-vlan primary mapping: none
Administrative private-vlan secondary mapping: none
Administrative private-vlan trunk native VLAN: 1
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Please advise as I'm almost stuck.
Thank you.

May be problem on Cisco side, Cisco is very clever, could assessed network traffic as a problem and close the port. When OS is running, then NIC Teaming working fine, but when you boot up server, "BIOS not running with NIC Teaming", in this moment
may occur problem on Cisco side.
I recommend, if you use Cisco, configure NIC Teaming in LACP mode and configure your two ports on Cisco to LACP, it's better way.
Regards,
thennet
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VLAN trunking to server and security

I have a question concerning interserver security.
I have a cat6513 and the port connected to a w2k3 server (single NIC) is in trunking mode carrying 2 VLANS a "customer" VLAN and "backup" VLAN. We serve multiple customers,each on their own specific VLAN, but all customers use the same generic backup service in a generic backup VLAN. Customers VLANS are separated by a FWSM but with this setup all the servers can connect to other servers on the backup VLAN.
What would be the best way to make sure that on the backup VLAN the servers can only connect to the backupserver and not ervers from oher customers.
We tried private VLAN's (which I think won't work because the port is a trunk)ad access-list but can't get it to work.
Any help or directions on how to solve this in well designed manner would be appreciated.
This is the config of a port in which vlan 11 is the backup vlan and vlan 31 the customer VLAN.
interface GigabitEthernet12/17
description
no ip address
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 11,31
switchport mode trunk

Hello,
my first thought would be to use protected ports ('switchport protected' interface command), which would prohibit ports configured with that command from talking to each other. The drawback is that this only works for ports on the same switch...
Regards,
GP

Host Server NIC setup

I am trying to build a Hyper-V cluster. I am stuck on the proper setup of the NICs on the 2 Physical servers. Each server has two, 10 Gb fiber ports. One I put on our "iSCSI vlan" (NetApp) and the other on our "server vlan".
I also have 2 other 1 Gb NICs on the servers for a total of 4 NICs. Each server has Windows Server 2012 R2 installed. I have a 3rd server with Windows Server 2012 R2 installed with VMM 2012 R2. Should I set up other vlans? Thanks
me

The type of solution depends on the kind of workloads you're going to run on the host. Generally speaking, application protocols are better equipped for handling variation in latency and bandwidth, while storage drivers may demonstrate some funny
behavior when connection to the disk becomes unstable. So, in a production environment, I would dedicate those 10Gbps to iSCSI and run the rest of the networks through 2x1Gbps team.
In a lab or development environment, I would sell those 1Gbps NICs on ebay and run all the traffic through 2x10Gbps team :-)
Gleb.

LYNC EDGE Server NIC Card Setup

Hello Guys,
I need Your help about setting up the NIC on my EDGE server. I already gone through the article about Set Up Network Interfaces for Edge Servers. as I understand there
are 2 NIC required on each EDGE server (1 Internal facing 7 another 1 is External facing). I just wanted to confirm is there any option to do this with only 1 NIC card or can we configure EDGE with 1 NIC only.?
Thanks in Advance.
Rishi Aggarwal
Regards Rishi Aggarwal

Possible? Yes, I do this on occasion against recommendations and best practices for companies who simply can't or won't set up a second DMZ (please don't split the NICs between your internal network and DMZ, it's just bad security). Everything
mostly seems to work just fine. But, recommended and supported? No.
Here's an article from David Paulino who's also been through it:
http://uclobby.com/2014/04/17/lync-edge-server-on-a-single-subnet/
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SWC Unified Communications

Gateway server NICs question

Hi,
I want to deploy a SCOM gateway server, but I am not sure, would this server have multi homed NICs? IE a NIC in the LAN and a NIC in the DMZ/WAN.
Thanks

SCOM doesn't need 2 NIC, It work with 1 NIC. Scom Gateway used to allow monitoring in another forest.
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Mai Ali

Physical Server NIC Not responding

Hi,
I am testing hyper-v on HP blade, I have 4 Physical NIC, which is bonded together and created and Hyperv Switch, Later Vnic Created for cluster, LM Management and VM,
due some reason I have deleted all Vswitch and Vnic and removed Bonding from 4 Physical Nic,
Now none of the physical nic are working with any Vlan IP

Hi Prasanth,
I assume that you are using switch independent mode for Teaming.
Please check the protocol bounding to the physical NIC .
Here is comparison before and after Teaming :
Best Regards,
Elton Ji
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NICE recorder - one way or garbled audio over SIP trunk.

Customer with CUCM 10.5.2 trying to integrate with a NICE recording solution. Everything configured per NICE documentation and rechecked that several times with the NICE vendor. However, if calling to/from the PSTN or legacy Nortel PBX to a Cisco 78xx or IP Communicator soft phone - we get one-way audio pushed out the SIP trunk to the NICE system. If it's a Cisco to Cisco phone call - the audio is garbled.
Has anyone experienced this issue with this type of integration - or the same issue with a SIP trunk to the CUCM to another system at all? We're at a loss here.
Thank you.

This document should help you:
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a008009484b.shtml

Server Load balancing issues

the servers are loadbalancing between the switches '3'
and '2' and the link between the two switches is blocked.
This link was forwarding before and thus any traffic going to the server was
send to the Servers correctly no matter on which switch they are active.
However after addition of another link in between the switches 'root'
and '1', the path cost to the root has decreased and thus the link
between the '2' and '3' is Blocking and the other link between
the '2' and '1' is Forwarding as it should be ideally. But
this would be creating an issue because the trafic coming from outside i.e.
through switch '1' to the server will be correctly send to the
server if the server NIC is active on the '3' because the Virtual MAC
addresses are binded accordinlgy. In case the server falls onto the other
NIC which is on the '2' the traffic won't be able to pass because the
MAC address is not binded on the trunk connecting the switches '1'
and '2'. This binding cannot be done because the same MAC address is
being learned on the another trunk on the '1' which is connecting
to 'root'. So if we bind the same Virtual MAC on two trunks on the same
switch ('1') then this will cause MAC Address Flapping on the
switch and hence canot be done.
In another case,we can able to bind virtuak MAC on two trunks on the same
switch('1') and it's working fine.
The servers are load balancing in round robin fashion. each server has 2 NICs and work in Active-Passive mode. The servers load balance each other when all their active links are connected to '3' switch but when two of the active NICs of two servers are connected to '3' and the rest of the two active NICs from the other two servers are connected to '2' switch then only the forst 2 servers load balance and the other 2 servers do not load balance.
Please help.
Thanks in advance.

In my experience, server load balancing is one of the most difficult things to get going properly in a switched LAN environment. Switched LANs are designed so that one MAC address can only be bound to one switch port. Therefore, if you have two NICs with the same MAC address (real or virtual), then you will get flapping somewhere.
I have seen various ways that the manufacturers try to get around this limitation of switched LANs. For example, one technique I have seen, practiced by ISA Server, is to use a multicast MAC address for the service so that frames go to both exit ports. But that does not always work well unless you tweak the network to acommodate it.
What sort of servers are they, and what system is used for the load balancing?
Kevin Dorrell
Luxembourg

NIC Teaming on Dell Servers

I am using BASP to setup NIC teaming on a Dell R720 server. My understanding is that both of the following teaming methods supports load balancing/sharing. ie: team with 2 NIC cards (1gbps each) I will get 2gbps throughput. Am I right?
• Smart Load Balancing and Failover
• Link Aggregation (802.3ad)
If I were to setup LACP, is it mandatory to define native vlan? Is the following command holds good?
interface Port-channel100
switchport trunk encapsulation dot1q
interface GigabitEthernet 0/1
description Uplink to Server (NIC-1)
switchport access vlan 100
switchport mode access
channel-group 100 mode active
spanning-tree portfast
interface GigabitEthernet 0/2
description Uplink to Server (NIC-2)
switchport access vlan 100
switchport mode access
channel-group 100 mode active
spanning-tree portfast

That's what I indicated in my original answer: The access VLAN and switchport modes should be defined on the Port-channel100 interface as well as the member interfaces if you want the bundle to actually be on VLAN 100.
Defining "spanning-tree portfast" ("spanning-tree portfast trunk" for 802.1q) on the Po100 interface should be done for servers. Once you set it on the Po100 interface, it should reconfigure the member interfaces automatically.

Connect standalone server to UCS (6248)?

Can you connect a normal server (w/1gb NIC) to a fabric interconnect? As far as I understand it, the only possible way would be to configure an uplink port (which gets created as a trunk) which would require the server NIC to also be in trunk mode, which I don't want to do. Appliance ports are only for direct connect NFS storage and Server ports are 10gb only (used mainly for connecting to a UCS chassis).
I have a general Dell server in the same rack as our UCS environment and I don't want to have to run a cable to an adjacent rack if possible. The only situation I can find where you would connect a non-blade to the FIs would be a C-Series standalone server, which uses an Uplink port on the FI.
Just wondering if anyone has used their FIs in this way.
Thanks!

Hi Ross,
The only rack servers which we support to be connected to the UCS FI are the C series servers. One of the reasons being they running the CIMC which the UCSM uses to manage and configure the rack server (almost like the way we do with our blades).
./Abhinav

Catalyst 3750 12.2(25)SD1 and dual nics

When a Catalyst 3750 stack master fails or leaves the stack, a cross-stack EtherChannel in trunk mode running Link Aggregation Control Protocol (LACP) protocol might stop forwarding traffic on some VLANs.
The workaround is to enable the stack-mac persistent feature by using the stack-mac persistent timer global configuration command. You can also use the shutdown interface configuration command and then the no shutdown command on the EtherChannel interface.
Network Infrastructure: LAN Routing and Switching
I have upgrade a Catalyst 37024 TS 2 switch stack to 12.2(25)SED1 from 12.1(14)EA. The switch has an Alpha Server Custer connected to it the cluster has two servers each having two nics . There is a active server which has an application IP address and each server has a Server IP address one nic active ata time.
All worked ok upto the upgrade. Now every night when the backup runs noone can access the application ip address or the acive server address but te offline server is pingable. This is only for devices outside the serrver VLAN. Devices within the server VLAN can hapily ping any address.
I thought this was arouing issue but all looks ok and the offline server can be pinged from any where.
the active server nics areon 1/0/20 and 2/0/24
Any one have any ideas?

I forgot to add if I shut both interfaces an then do a no shout on both the issue is resolved until the next night.

CSS Bounces on a Server /Box Down issue

Hi,
We deployed a redundant CSS11501 with the Server's directly connected. There is no specific Master between the two.
When a server goes down (the box itself w/2 NIC), CSS-A detects a link failure and will fail-over to CSS-B. A minute after CSS-B becomes a master, it will also detect a link failure (secondary NIC of the Box). It will then switch back to CSS-A causing a loop until the Server is fixed. As a temporary work around, we shut the interfaces connecting to the Down Server on both CSS so it won't monitor the failed link.
This requires human intervention that our customer doesn't want.
We are using the 8.10 Standard Services on both CSS11501.
thanks and regards,
Dennis

If you use CSS in redundancy mode or active/active, to avoid the looping of virtual-router transitions, I would suggest the following.
1/ put a L2 switch at the server side, between CSS and Server NICs. Configure Etherchannel or trunk between the L2s.
2/ configure NIC teaming on the server and make sure they host a virtual ip address and that let the CSS talk to that virtual ip address and its ports, as thumpercisco was saying.
3/ Do not let the CSS to monitor its own physical ports to trigger a failover event, suggest to use critical services to monitor upstream(FW or router ip) plus your downstream (mngt ip on L2) ip addresses. You will be safe now as you can not afford to trigger a failover event on the CSS when one single server NIC fails or someone pulled out a cable etc(assuming no L2 being used).
4/ also use reporter services to monitor you vrrid peers, let it also trigger a failover event.
To summarize, if you do not have a server side L2 switch, do not monitor the physical ports as a false failover event will occur.
thanks
Suresh Kumar
Installed the 201st CSS last week and still going!

Trunking on Server NIC

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