Hello,
in short : how can i make ESX Teaming declare one of the NICs as failed even it has link and connection to the switch, for example by pinging the default gateway.
in long: I Have the following network scenario:
i want to defend a situation where SWITCH C is failing, how can i do it ?
actually server A is a blade server that is connected to 2 switched that are inside the blade center, so it is even more common scenario.
Thank you
Ben.
Your connection would not be in a failed state, you would have to do this with a routing protocol and metrics.
Especially with a upstream switch as the failure point.
Hey
You can change your failure detection settings from link state, to beacon probing.
www.cisco.com/en/US/docs/solutions/Enterprise/Data_Center/vmware/VMwaredg.pdf
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~y
In addition to using the Beacon feature of ESX you also have the option to use L2 Like failure detection feature if your switch supports it.
For example BLADE switches in HP Bladesystem have this feature and is called "Uplink Failure Detection". Some of the Cisco switches also have this feature and it is called "Link State Tracking". See
http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=10098&slic... if you have Cisco switches. I am providing the details of BLADE switches in HP Bladesystem below:
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BLADE's Uplink Failure Detection (UFD) Feature for uplink state tracking:
Uplink Failure Detection (UFD) on switches in HP BladeSystem
and NEC Sigma allows the switch to monitor specific uplink ports to detect link
failures. When the switch detects a link failure, it automatically disables
specific downlink ports. The corresponding server's network adapter can detect
the disabled downlink, and trigger a network-adapter failover to another port
on the switch, or another switch in the chassis.
The switch automatically enables the downlink ports when the
uplink returns to service.
To use UFD, you must configure a Failure Detection Pair and
then turn UFD on. A Failure Detection Pair consists of the following groups of
ports:
Link to Monitor (LtM)
The Link to Monitor group consists
of one uplink port, or one trunk group that contains only uplink ports. The
switch monitors the LtM for link failure.
Link to Disable (LtD)
The Link to Disable group consists
of one or more downlink ports and trunk groups that contain only downlink
ports. When the switch detects a link failure on the LtM, it automatically
disables all ports in the LtD.
When the LtM returns to service, the switch automatically
enables all ports in the LtD.
If Spanning Tree Protocol (STP) is enabled on ports in the
LtM, then the switch monitors the STP state and the link status on ports in the
LtM. The switch automatically disables
the ports in the LtD when it detects a link failure or STP Blocking state.
When the switch determines that ports in the LtM are in STP
Forwarding State, then it automatically enables the ports in the LtD, to fall
back to normal operation.
BLADE Platform/Software Availability
BLADE WebOS:
All versions
Runs on all BLADE switches in HP
BladeSystem:
Runs on all BLADE switches in NEC
SigmaBlade:
Limitations
Only one Failure Detection pair (one group of
Links to Monitor and one group of Links to Disable) is supported on each switch
(all VLANs and Spanning Tree Groups).
Ports that are already members of a trunk group
are not allowed to be assigned to an LtM.
A trunk group configured as an LtM can contain
multiple uplink ports , but no downlink ports or interconnect ports.
An uplink port cannot be added to a trunk group
if it already belongs to an LtM.
An LtD can contain one or more ports, and/or one
or more trunks
A trunk group configured as an LtD can contain
multiple downlink ports, but no uplink ports or interconnect ports.
Sample Configuration
1. Assign
uplink ports to be monitored for communication failure.
>> Main#
/cfg/ufd/fdp ena
(Enable Failure Detection Pair)
>> FDP# ltm
(Select Link to Monitor menu)
>> Failure
Link to Monitor# addport 21 (Monitor uplink port 21)
2. Assign downlink ports to disable when
an uplink failure occurs.
>>
/cfg/ufd/fdp/ltd
(Select Link to Disable menu)
>> Failure
Link to Disable# addport 1
(Add port 1 as a Link to Disable)
>> Failure
Link to Disable# addport 2
(Add port 2 as a Link to Disable)
3. Turn UFD
on.
>> /cfg/ufd/on
(Turn Uplink Failure Detection on)
>> Uplink
Failure Detection# apply (Make your changes active)
>> Uplink
Failure Detection# save
(Save for restore after reboot)
*Add text for IBM L2
Failover*
Troubleshooting
Monitoring Uplink
Failure Detection
The UFD information menu displays the current status of the
LtM and LtD, and their member ports or trunks. For example:
>>
Information# ufd
Uplink Failure
Detection: Enabled
LtM status: Down
Member STG
STG State Link Status
-
---
-
-
port 24 down
1 DISABLED
10 DISABLED *
16 DISABLED *
= STP turned off
for this port.
LtD status: Auto
Disabled
Member Link Status
-
-
port
1 disabled
port
2 disabled
port
3 disabled
port
4 disabled
Use the /stats/ufd
command to find out how many times link failure was detected on the LtM, how
many times Spanning Tree blocking state was detected on the LtM, and how many
times UFD disabled ports in the LtD.