Forum Discussion

mokkan's avatar
mokkan
Level 6
11 years ago

LLT over or UDP or Ethernet

Hello,   When to setup hearbeat Link, which one we need to choose LLT over Ethernet or UDP? Can you explain the senario when to use Ethernet and when to use UDP?  
Basics
business continuity
Cluster Server
UNIX
  • Gaurav_S's avatar
    Gaurav_S
    11 years ago

    Symantec recommends that you configure heartbeat links that use LLT over Ethernet, unless hardware requirements force you to use LLT over UDP. If you want to configure LLT over UDP, make sure you meet the prerequisites.

    UDP makes LLT packets routable and thus able to span longer distances more economically.

    Reder to admin guide for building the understanding

    https://sort.symantec.com/public/documents/sfha/6.0/linux/productguides/html/vcs_install/ch08s05.htm

     

    G

     

  • Gaurav_S's avatar
    Gaurav_S
    11 years ago

    Also to note, The LLT-over-UDP configuration works over the IP layer, and is therefore a little slower than the LLT-over-Ethernet configuration

    G

  • mikebounds's avatar
    mikebounds
    11 years ago

    Thats correct.

  • mikebounds's avatar
    mikebounds
    11 years ago

    "public network" means it is a network used by other things (i.e it has IP addresses assigned) as oppose to a private network which is private just for LLT.

    A low-pri heartbeat on a "public network" can still use LLT over Ethernet (so LLT doesn't use the IPs on the interfaces) and this is the norm.

    You cannot use a mix of LLT over ethernet and UDP - you must use one or the other for all links (including low-pri)

    Mike

mikebounds's avatar
mikebounds
Level 6
11 years ago

"public network" means it is a network used by other things (i.e it has IP addresses assigned) as oppose to a private network which is private just for LLT.

A low-pri heartbeat on a "public network" can still use LLT over Ethernet (so LLT doesn't use the IPs on the interfaces) and this is the norm.

You cannot use a mix of LLT over ethernet and UDP - you must use one or the other for all links (including low-pri)

Mike