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■ Make sure that the LLT private links are on different physical networks.
Ifthe LLTprivate linksare not ondifferent physicalnetworks, thenmake sure
that the linksare on separate subnets.Set the broadcast address in/etc/llttab
explicitly depending on the subnet for each link.
See “Broadcast address in the /etc/llttab file” on page 158.
■ Makesure thateachNIC hasan IPaddress thatis configuredbeforeconfiguring
LLT.
■ Make sure the IP addresses in the /etc/llttab files are consistent with the IP
addresses of the network interfaces.
■ Make sure that each link has a unique not well-known UDP port.
See “Selecting UDP ports” on page 160.
■ Set the broadcast address correctly for direct-attached (non-routed) links.
See “Sample configuration: direct-attached links” on page 161.
■ For the links that cross an IP router, disable broadcast features and specify
the IP address of each link manually in the /etc/llttab file.
See “Sample configuration: links crossing IP routers” on page 163.
Broadcast address in the /etc/llttab file
The broadcast address is set explicitly for each link in the following example.
■ Display the content of the /etc/llttab file:
# cat /etc/llttab
set-node Node0
set-cluster 1
link link1 udp - udp 50000 - 10.20.30.1 10.20.30.255
link link2 udp - udp 50001 - 10.20.31.1 10.20.31.255
■ Verify the subnet mask using the ifconfig command to ensure that the two
links are on separate subnets.
# ifconfig
eth2 Link encap:Ethernet HWaddr 00:04:23:AC:2B:E4
inet addr:10.20.30.1 Bcast:10.20.30.255 Mask:255.255.255.0
eth3 Link encap:Ethernet HWaddr 00:04:23:AC:2B:E5
inet addr:10.20.31.1 Bcast:10.20.31.255 Mask:255.255.255.0
The link command in the /etc/llttab file
Review the link command information in this section for the /etc/llttab file. See
the following information for sample configurations:
Advanced VCS installation topics
Using the UDP layer for LLT
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