Adding and removing LLT links


Adding and removing LLT links
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You can use the lltconfig command to add or remove LLT links when LLT is running.

See the lltconfig(1M) manual page for more details.

Note:

When you add or remove LLT links, you need not shut down GAB or the high availability daemon, had. Your changes take effect immediately, but are lost on the next restart. For changes to persist, you must also update the /etc/llttab file.

To add LLT links

Depending on the LLT link type, run the following command to add an LLT link:

For ether link type:

# lltconfig -t devtag -d device 
[-b ether ] [-s SAP] [-m mtu]  [-I] [-Q]

For UDP link type:

# lltconfig -t devtag -d device 
-b udp [-s port] [-m mtu]
-I IPaddr -B bcast

For UDP6 link type:

# lltconfig -t devtag -d device 
-b udp6 [-s port] [-m mtu]
-I IPaddr [-B mcast]

For RDMA link type:

# lltconfig -t devtag -d device
 -b rdma -s port [-m mtu]
 -I IPaddr -B bcast

Where:

devtag	Tag to identify the link
device	Device name of the interface. For link type ether, you can specify the device name as an interface name. For example, eth0. Preferably, specify the device name as eth-macaddress. For example, eth- xx:xx:xx:xx:xx:xx. For link types udp and udp6, the device is the udp and udp6 device name respectively. For link type rdma, the device name is udp.
bcast	Broadcast address for the link type udp and rdma
mcast	Multicast address for the link type udp6
IPaddr	IP address for link types udp, udp6 and rdma
SAP	SAP to bind on the network links for link type ether
port	Port for link types udp, udp6 and rdma
mtu	Maximum transmission unit to send packets on network links

For example:

For ether link type:

# lltconfig -t eth4 -d eth4 -s 0xcafe -m 1500

For UDP link type:

# lltconfig -t link1 -d udp -b udp -s 50010
-I 192.168.1.1 -B 192.168.1.255

For UDP6 link type:

# lltconfig -t link1 -d udp6 -b udp6 -s 50010 -I 2000::1

For RDMA link:

# lltconfig -t link1 -d udp -b rdma -s 50010
 -I 192.168.1.1 -B 192.168.1.255

Note:

If you want the addition of LLT links to be persistent after reboot, then you must edit the /etc/lltab with LLT entries.

To remove an LLT link

Run the following command to disable a network link that is configured under LLT.
```
# lltconfig -t devtag -L disable
```
Wait for the 16 seconds (LLT peerinact time).
Run the following command to remove the link.
```
# lltconfig -u devtag
```

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