02-19-2010 07:16 AM
We have problems with a vPC on my Nexus 1000v. I have two ESX Servers in a HP c-class enclosure. I use CBS3020 Switches. On my Hardware Switches I can see my Nexus as a CDP Neighbor on every Interface it should be. On the Nexus I am missing the CDP Neighbor for the Interface Eth3/4. The status of the Interface stays in link-up state.
After changing of the Network Adapter everything works fine. After installing the original Adapter the Status is up up as well. So it can't be a Hardware malfunction. We had this problem several time now, after changing the Network Adapter everything works fine. But I don't feel very good with this problem.
Did anybody had similar problems? We use the latest Software releases, so upgrading isn't a solution.
nexus# sh int status
--------------------------------------------------------------------------------
Port Name Status Vlan Duplex Speed Type
--------------------------------------------------------------------------------
mgmt0 -- up routed full 1000 --
Eth3/1 -- up trunk full 1000 --
Eth3/3 -- up trunk full 1000 --
Eth3/4 -- link-up trunk full auto --
Eth3/5 -- up trunk full 1000 --
Eth3/6 -- up trunk full 1000 --
Eth3/7 -- up trunk full 1000 --
Eth4/1 -- up trunk full 1000 --
Eth4/3 -- up trunk full 1000 --
Eth4/4 -- up trunk full 1000 --
Eth4/5 -- up trunk full 1000 --
Eth4/6 -- up trunk full 1000 --
Eth4/7 -- up trunk full 1000 --
nexus# sh port-channel summary
Flags: D - Down P - Up in port-channel (members)
I - Individual H - Hot-standby (LACP only)
s - Suspended r - Module-removed
S - Switched R - Routed
U - Up (port-channel)
--------------------------------------------------------------------------------
Group Port- Type Protocol Member Ports
Channel
--------------------------------------------------------------------------------
1 Po1(SU) Eth NONE Eth3/1(P) Eth3/7(P)
2 Po5(SU) Eth NONE Eth3/3(P) Eth3/4(D)
3 Po6(SU) Eth NONE Eth3/5(P) Eth3/6(P)
4 Po2(SU) Eth NONE Eth4/1(P) Eth4/7(P)
5 Po7(SU) Eth NONE Eth4/3(P) Eth4/4(P)
6 Po8(SU) Eth NONE Eth4/5(P) Eth4/6(P)
port-profile type ethernet uplink-storage
description uplink-storage
vmware port-group
switchport mode trunk
switchport trunk allowed vlan 562-563
channel-group auto mode on sub-group cdp
no shutdown
system vlan 562-563
state enabled
interface Ethernet3/3
inherit port-profile uplink-storage
interface Ethernet3/4
inherit port-profile uplink-storage
interface port-channel2
inherit port-profile uplink-storage
sub-group cdp
02-21-2010 12:23 AM
Hi,
can you please elaborate on "changing the network adapter" part. what are the differences between original and newer network adapters.
thanks,
Munish.
02-21-2010 11:00 PM
Hi
There are no differences between the two network adapters.
That's the strange thing...
02-22-2010 04:01 PM
when you configure the vPC-HM with "sub-group cdp" the port will be kept down until the CDP information is received from the upstream switch. There could be some delay between the availability of the CDP information and port bring up.
To avoid such delays, you can use "mac-pinning" in your uplink profile, instead of "sub-group cdp" as below.
"channel-group auto mode on mac-pinning"
thanks,
Naren
02-23-2010 07:01 AM
Seems to work on my test-environment. Can I change the to Mac-Pinning without Interrupts or do I have to work at nightime? :-)
Tanks anyway
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