VSS Fast-Hello with dual connection

[marcio.tormente]

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

[Reza Sharifi]

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

[marcio.tormente]

Hello

I'm using 02 Catalyst 4507.

[Reza Sharifi · Accepted solution]

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