7609 Vlan Virtual-Port

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环境:

7609做接入层交换机,下联DSLAM,上联核心,其余的是2层应用。

问题:

Console 有log告警,并且只出现几次,分别是module8 和module9,具体告警如下所示:

%PM-SP-STDBY-4-LIMITS: The number of vlan-port instances on module 8 exceeded the recommended limit of 1800
%PM-SP-4-LIMITS: The number of vlan-port instances on module 8 exceeded the recommended limit of 1800
%PM-SP-STDBY-4-LIMITS: The number of vlan-port instances on module 9 exceeded the recommended limit of 1800
%PM-SP-4-LIMITS: The number of vlan-port instances on module 9 exceeded the recommended limit of 1800

解决问题:

让客户采集信息:
—————————————————————————
show log
show tech
show inter trunk
show vlan virtual-port
show vlan virtual-port slot 9
show platform hardware capacity vlan
show platform hardware capacity system
show spanning-tree summ total
remote command switch test pm vpsanity 0
show etherchannel detail
—————————————————————————


分析客户采集回来的信息,得出以下结论:

Symptom:
—————————————————————————
%PM-SP-4-LIMITS: The number of vlan-port instances on module 9 exceeded the recommended limit of 1800
%PM-SP-4-LIMITS: The number of vlan-port instances on module 8 exceeded the recommended limit of 1800

The default message is %PM-4-LIMITS:. The number of VLAN port instances on [chars] exceeded the recommended limit of [dec].

This message means that the total number of individual VLAN ports, counted over the module or switch, have exceeded the recommended limit. VLANs can be counted more than once. If VLAN 1 is carried on ten interfaces, it counts as ten VLAN ports. On some platforms bundling is also ignored for purposes of this count. If eight interfaces on the same module are in one bundle, and the port channel is carrying VLAN 1, it counts as eight VLAN ports. [chars] is the module name (for example, switch or the module number), and [dec] is the recommended limit.

Workaround:
—————————————————————————
The maximum logical interfaces for Per VLAN Spanning Tree Plus (PVST+) is 1800 per module and 13,000 total for the switch. The show spanning-tree summary totals command displays the number of logical interfaces in the STP Active column.
This error message shows up if the limits described in the following document are exceeded:
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SXF/native/release/notes/OL_4164.html#wp26366

Follow is logical interfaces for module 8 and module 9 and total is 1800 per module.
—————————————————————————
Slot 8
——-
Total slot virtual ports 1425
Slot 9
——-
Total slot virtual ports 1346

—————————————————————————

I found some question in the configuration:

1 The GigabitEthernet8/1 and GigabitEthernet8/2 not limited the vlan and allow all vlan in trunk.
2 The GigabitEthernet9/1 and GigabitEthernet9/2 not limited the vlan and allow all vlan in trunk, follow is information for slot 9:
—————————————————————————
#show vlan virtual-port slot 9
Slot 9
Port        Virtual-ports
————————-
Gi9/1               590
Gi9/2               590
Gi9/3               18
Gi9/4               1
Gi9/5               1
Gi9/6               22
Gi9/8               7
Gi9/9               43
Gi9/10              57
Gi9/11              12
Gi9/12              1
Gi9/13              3
Gi9/14              1

—————————————————————————

So i suggest you do follow action plan:
—————————————————————————
1 Limit the allow vlan in trunk port.
2 Reduce the number of trunks and VLANs configured in the module or switch as recommended in [dec]. Enter the show interfaces trunk privileged EXEC command to see the total number of trunks and VLANs.

In Addition:
The gi9/1, gi9/2, gi8/1 and gi8/2 link to DSLAM, DSLAM link a lot of ADSL customer, so cannot limit the allow vlan.
Because it is l2 network, so change downlink (link to DSLAM port) to other module.

本文出自 Frank's Blog

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