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Participant

VSS Fast-Hello with dual connection

Hello Folks!

 

Could you someone tell me if it's possible to use 02 interfaces (ether-channel) to VSS Fast-Hello?

today I'm using one, but after someone removes the cable and the core loses all connection with access switches, I want to create redundancy to avoid this kind of situation.

 

 

Thanks

 

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted

Hi,

Is it the same for the 4500 series. So, Portchannles but you can have up to 4 physical links.

When you configure fast hello dual-active interface pairs, note the following information:

  • You can configure a maximum of four interfaces on each chassis to connect with the other chassis in dual-active interface pairs. Attempting to configure more than four interfaces causes an error message to display (and your command is rejected).
  • Each interface must be directly connected to the other chassis and must not be a VSL link. We recommend using links from a switching module not used by the VSL.
  • Each interface must be a physical port. Logical ports such as an SVI are not supported.
  • The fast-hello links are Layer 2 ports.
  • Configuring fast hello dual-active mode automatically removes all existing configuration from the interface and restricts the interface to fast hello dual-active configuration commands. It can only be used for “fast-hello” traffic.
  • Unidirectional link detection (UDLD) is disabled on fast hello dual-active interface pairs.
  • Do not configure fast-hello ports on an oversubscribed line card. Doing so might lead to a loss of fast-hello messages, impacting the functionality of fast-hello based dual-active detection.
  • link:
  • https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-8-0E/15-24E/configuration/guide/xe-380-configuration/vss.html
  • HTH

View solution in original post

3 REPLIES 3
Highlighted
Hall of Fame Expert

Hi,

What platform and what IOS are you using? If you are using StackWise virtual, you can use up to 4 links but not Portchannel.

see link below

 

https://www.cisco.com/c/dam/en/us/products/collateral/switches/catalyst-3850-series-switches/q-and-a-c67-738577.pdf

 

HTH

Highlighted

Hello

I'm using 02 Catalyst 4507.
Highlighted

Hi,

Is it the same for the 4500 series. So, Portchannles but you can have up to 4 physical links.

When you configure fast hello dual-active interface pairs, note the following information:

  • You can configure a maximum of four interfaces on each chassis to connect with the other chassis in dual-active interface pairs. Attempting to configure more than four interfaces causes an error message to display (and your command is rejected).
  • Each interface must be directly connected to the other chassis and must not be a VSL link. We recommend using links from a switching module not used by the VSL.
  • Each interface must be a physical port. Logical ports such as an SVI are not supported.
  • The fast-hello links are Layer 2 ports.
  • Configuring fast hello dual-active mode automatically removes all existing configuration from the interface and restricts the interface to fast hello dual-active configuration commands. It can only be used for “fast-hello” traffic.
  • Unidirectional link detection (UDLD) is disabled on fast hello dual-active interface pairs.
  • Do not configure fast-hello ports on an oversubscribed line card. Doing so might lead to a loss of fast-hello messages, impacting the functionality of fast-hello based dual-active detection.
  • link:
  • https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/XE3-8-0E/15-24E/configuration/guide/xe-380-configuration/vss.html
  • HTH

View solution in original post

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