LLT over or UDP or Ethernet

Usually you should use LLT over Ethernet - you only need to use UDP if  you need a route between your links as LLT over Ethernet is non routable.

Mike

Thank you Very much for all the info.  If I understand correctly,  if we are configuring LLT in same subnet don't need the UDP.  If we are confiuguring LLT and needs to be routed through different network, then need to configure UDP. Am I right?

There is a document to add low priority link using public network. What does it mean by public network?

If we are using public network I can't use LLT over ethernet right ? I need to  use LLT over UDP right? I need to have mix of LLT over thernet and UDP ?

After configuring 2 high priority link for LLT, you can keep addition redundancy by having a low pri link. This low pri link is usually the public network link on server which is configured for accessing applications or database on server.

High priority links are used for cluster communications to GAB as well as heartbeat signals. Low priority links, during normal operation, are used for heartbeat and link state maintenance only, and
the frequency of heartbeats is reduced to 50% of normal to reduce network overhead.
If there is a failure of all configured high priority links, LLT will switch all cluster communications traffic to the first available low priority link. Communication traffic will revert back to the high priority links as soon as they
become available.

Also, note, if its a SFRAC setup, Symantec does not recommend using low pri link as it may flood SFRAC data if high pri links fail

https://sort.symantec.com/public/documents/vcs/5.1sp1/aix/productguides/html/vcs_notes/ch01s08s18s03.htm

As long as connection is made for low pri link & LLT can detect it, I don't believe there is any specific recommendation to use low pri link on UDP

G

thank you very much for all the answers