Cisco Switching/Routing :: 7009 - VPC Cluster To VSS Using Port-Channels
Nov 6, 2012
We have a vPC cluster of two Nexus 7009 that needs to be connected with a VSS cluster of two Catalyst 6509s. The VSS has been working fine for a while and the vPC cluster is new equipment.
Attached there is a detailed diagram of the connections; the VSS cluster connects the interfaces Ten1/2/8 and Ten 2/2/8 using the PortChannel 28 going to the the vPC cluster to the interfaces Eth 4/18 of each switch.
Both the vPC and the VSS are well configured; last night we tried to brought up the connection between the two clusters but only the first interface comes up within the etherchannel; the secondary one did not come up and shows (not receiving LACP packets).
We know Layer 1 is fine because if we remove the interface from the EtherChannel it does come up; but causes some STP loop and bring the network down; thus the solution is to form a EtherChannel.
At the VSS Clúster we see LACP packets being sent with sh lacp counters but we DO NOT see LACP packets being received in the interface of the secondary Nexus.
Right now, this is not possible to troubleshoot since it is a production enviroment; so I'm looking for problems with the configuration or recommendations to follow in order to apply them tomorrow night during a new maintenance window.
These are the configurations:
#######vPC cluster of Nexus 7009######
--N7K-1--
interface port-channel418
description Uplink 20 GE hacia VSS
switchport
switchport mode trunk(code)
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Mar 10, 2012
We have a pair Cisco 6509 switch in which 2 * 48 Port 1G line cards and 1 * 16 Port 10G line Card, FWSM and Sup 720 are installed.We have Cisco UCS and HP Blade servers.Cisco UCS servers are connected to Cisco 6509 switch using Fabric Interconnect, and HP Servers are directly connected to core switches.Recently the team made many changes in the network. Upgraded the IOS in Cisco 6509 switch, Configured Port profiling , MAC Pinning , HBA Cards to UCS / Nexus 1000V Infrastructure. After this change they lost the connectivity to UCS and HP Serers. Every tower is checking at their end.
The Network Team has reverted back the core switch with old IOS , but still the problem persisit.I could only see the following error log in the core switch. There are two port-channels one between core 1 and core 2. The other is between core switch and FWSM module. [code]
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Dec 26, 2012
We are facing issue with mac address learnt from different port-channels, Connectivity is like 6500 as core running VSS and 4500 access switches are connected to Core and WLC is also connected to Core.WLC to 6500 PO 60 , 4500 to 6500 PO 32.
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Sep 5, 2012
I have a dual-homed fabric (Nexus 2248 dual attached to two Nexus 5020's via vPC). On this Nexus 2248 is a server that has a four port LACP etherchannel. The ports do not appear to be load balancing correctly. The output below shows the four ports in use and it clearly shows port e138/1/10 as getting the most use. When I use the "show port-channel load-balance forwarding-path..." command on either of the vPC switches for various source and destination IP's that use this link, it shows them correctly load-balancing across the four ports. But we do not see this when looking at stats on both the server side and the switch side.
dc5020-3g# sh int e138/1/10,e138/1/12,e138/1/14,e138/1/16 | i seconds
30 seconds input rate 552 bits/sec, 69 bytes/sec, 0 packets/sec
30 seconds output rate 130120 bits/sec, 16265 bytes/sec, 161 packets/sec
Load-Interval #2: 5 minute (300 seconds)
30 seconds input rate 40 bits/sec, 5 bytes/sec, 0 packets/sec
[code]....
**************** Config info below. This is a vPC pair and the port configs are identical on both switches so I'm only showing the configs for one switch to keep it simple.
dc5020-3g# sh port-channel load-balance
Port Channel Load-Balancing Configuration:
System: source-dest-ip
Port Channel Load-Balancing Addresses Used Per-Protocol:
Non-IP: source-dest-mac
IP: source-dest-ip source-dest-mac
[code]....
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Apr 3, 2013
current topology is build from 4 6500 switches connected in a ring topology. Using Port channel (2x 10Gbit) links to connect left side top and bottom 6500's (DC1), 10 G bit link to connect right side 6500's (DC2) In between a 1 G bit link is used to connect top 6500's (DC1-DC2) and the same for bottom 6500's (DC1-DC2).
Path costs are 5 and 6 so the T5/4 from bottom right is blocking. Bandwidth demands are increasing, so thinking about adding extra 1 G bit links to the existing ones and create ether channels. Path costs here are 4 and 5, so T5/4 from bottom right is still blocking, but when the bottom 2 G bit port-channel is loosing one 1 G bit link the path costs of both directions become equal. So I am worried that STP will not re converge and leave me with a congested 1 G bit link. I cannot test this setup in a lab, are there any options for STP to re-converge here?
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Sep 27, 2012
I am having an issue on a Cisco 3750 stack where when the stack master is rebooted, all my lacp port-channels drop and then come back up again. After doing some investigation It seems that it is happening because of lacp using the stack master mac-address as part of the system-id, so when the stack master reboots, the stack mac changes. I see that there is the command: stack-mac persistent timer 0
There is this warning about using this command:
When you configure this feature, a warning message displays the consequences of your configuration. You should use this feature cautiously. Using the old master MAC address elsewhere in the domain could result in lost traffic.
My question are:
Are there any other consequences to using this command (apart from moving the switch/mac to another location in the network)It mentions 'If the entire switch stack reloads, it acquires the MAC address of the master as the stack MAC address' Is this still the case if you have the stack-mac persistent timer to 0? Does using channel-group mode on for the port-channels still use the same mechanism of having a system-id? (Will the channels flap using 'mode on' when rebooting the stack master.
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I have in logs following error message:
%DEVICE_TEST-2-PWR_MGMT_BUS_FAIL: Module 1
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Feb 3, 2013
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Connectivity is like this.
Nexus 1 Nexus2
Slot 3: F2 card Slot 3 : F2 card
Slot 3: M2 card Slot 3 : M2 card
[Code]......
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Nexus 7009, NX-OS 6.0(1)
# sh logging server
Logging server: enabled
{redacted}
server severity: debugging
server facility: local7
server VRF: default
[code].....
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