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New Member

Vss: Issue with dual active-IP Bfd

Hi All,

I am facing a problem while configuring Virtual switching system(vss), I need to configure dual active

scenario with IP-BFD but whenever I try to configure the interfaces with command "bfd interval 100 min_rx 100 multiplier 3"

it gives me an error like below.

SW1(config)#int g1/2/12

SW1(config-if)#bfd interval 100 min_rx 100 multiplier 3

^

% Invalid input detected at '^' marker.

SW1(config-if)#bfd ?

% Unrecognized command

SW1(config-if)#bfd

I am using the image s72033-ipbasek9-mz.122-33.SXH3.bin which can support IP-BFD and the line card using is

WS-X6748-GE-TX and it also compatible with VSS.

Anybody who knows about this please help me to resolve.

Regards

  • LAN Switching and Routing
14 REPLIES
Hall of Fame Super Silver

Re: Vss: Issue with dual active-IP Bfd

Hello Rangin,

it looks like that IP-BFD has to be used on an inter-switch link

see

Dual-Active Detection Using IP BFD

To use the IP BFD detection method, you must provision a direct Ethernet connection between the two switches. Regular Layer 3 ping will not function correctly on this connection, as both chassis have the same IP address. The virtual switching system instead uses the Bidirectional Forwarding Detection (BFD) protocol.

If the VSL goes down, both chassis create BFD neighbors, and try to establish adjacency. If the original active chassis receives an adjacency message, it realizes that this is a dual-active scenario, and initiates recovery actions as described in the "Recovery Actions" section.

Note If FlexLinks are configured on the VSS, we recommend using the PAgP detection method. Do not configure FlexLinks and BFD dual-active detection on the same VSS.

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html#wp1063892

And:

For line redundancy, we recommend configuring at least two ports per switch for dual-active detection. For module redundancy, the two ports can be on different switching modules in each chassis. Do not use links from the VSL.

see the section

"Configuring BFD Dual-Active Detection"

This example shows how to configure interfaces for BFD dual-active detection:

Router (config)# interface gigabitethernet 1/9/48

Router (config-if)# no switchport

Router (config-if)# ip address 200.230.230.231 255.255.255.0

Router (config-if)# bfd interval 100 min_rx 100 multiplier 3

Router (config-if)# no shutdown

Router (config-if)# interface gigabitethernet 2/1/48

Router (config-if)# no switchport

Router (config-if)# ip address 201.230.230.231 255.255.255.0

Router (config-if)# bfd interval 100 min_rx 100 multiplier 3

Router (config-if)# no shutdown

I guess you may need the no switchport command but on stand alone 6509 that is the default.

Hope to help

Giuseppe

New Member

Re: Vss: Issue with dual active-IP Bfd

Hi, By the look at the error it looks that you havent changed your switch into the Virtual Switch Mode ! The bfd function works only after you change into Virtual Mode !

New Member

Re: Vss: Issue with dual active-IP Bfd

Hi Friends,

Actually the error was due to IP-Base image, so I upgraded it to image "s72033-ipservicesk9_wan-mz.122-33.SXH3 " then I configured bfd commands under interface, it worked fine and we tested dual active scenario.

Thanks

Hall of Fame Super Silver

Re: Vss: Issue with dual active-IP Bfd

Hello Rangin,

good news that you solved the issue and it is kind that you provided a feedback that can help other collegues starting to work on VSS.

Actually, in some other post someone was asking if VSS is supported in IP base version or not.

Best Regards

Giuseppe

New Member

Re: Vss: Issue with dual active-IP Bfd

Hi Giuseppe,

With IP-Base image I configured VSS and tested redundancy and everything, even I tested Dual-Active scenario with Pagp by use of 3750 as edge switch. That time there were some problem since the IoS of 3750 was 12.2(33) and I upgraded to 12.2(46) which is the recommended one to support Pagp+. But the probelm with Pagp dual-active scenario is 3750s " in stack " will not support Pagp it only supports LACP.

Because of that issue I tried to configure IP-BFD and it created problems, then I upgraded the 6509 image to IPservices, everything is OK.

Regards

Rangin

New Member

Re: Vss: Issue with dual active-IP Bfd

Hi Rangin,

So can we use 3750 with an upgraded image, as a single switch to detect Dual Active Scenario ? Will it support Enhanced PAgP ?

New Member

Re: Vss: Issue with dual active-IP Bfd

New Member

Re: Vss: Issue with dual active-IP Bfd

Hey

Just want to mention that IP-Base does not support VSS. The minimum FeatureSet which supports VSS is IP Services.

Anonymous
N/A

Re: Vss: Issue with dual active-IP Bfd

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