Check interfaces:
[root@xenserver1 ~]# xe pif-list
uuid ( RO) : cc9937fa-0435-7664-a73a-c9bfa803e50e
device ( RO): eth3
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): e7a75876-ee65-950e-7975-6751eca3795b
uuid ( RO) : 3a5ef383-650a-ded9-d636-4c86a6831443
device ( RO): eth1
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): bd91ea1e-6184-4f7b-6360-0134f39b9751
uuid ( RO) : 4c04ef06-9707-67ac-1859-6e6617d507a7
device ( RO): eth2
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): 8d829397-e8d1-fdc2-b62d-8b23cf6da7dd
uuid ( RO) : 41b55f45-91ff-90e1-0a13-dbb680e744e9
device ( RO): eth0
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): 78613a9f-aede-edc6-39f4-40c4c5883de2
uuid ( RO) : 72ff5545-3d4b-5038-aa15-dc93998b8dab
device ( RO): eth0
currently-attached ( RO): true
VLAN ( RO): 21
network-uuid ( RO): 8310ea88-dad4-c989-19db-5c5fdb8d3edc
Create internal interface - not bounded to any physical interface :
[root@xenserver1 ~]# xe network-create name-label="anylan" name-description="anylan for testing"
919b5b1c-201f-fed2-c39d-21946f278bdc
Create tagged network interface bounded to physical NIC:
[root@xenserver1 ~]# xe network-create name-label="vlan402" name-description="VLAN 402"
d5b6969c-eff4-79b2-0088-7740f8a9b492
[root@xenserver1 ~]# xe vlan-create network-uuid=d5b6969c-eff4-79b2-0088-7740f8a9b492 pif-uuid=41b55f45-91ff-90e1-0a13-dbb680e744e9 vlan=402
7dadd3ec-b8a2-5b40-0855-0ef365dc9f00
Example pif-list after adding new interface
[root@xenserver1 ~]# xe pif-list
uuid ( RO) : 7dadd3ec-b8a2-5b40-0855-0ef365dc9f00
device ( RO): eth0
currently-attached ( RO): true
VLAN ( RO): 402
network-uuid ( RO): d5b6969c-eff4-79b2-0088-7740f8a9b492
uuid ( RO) : cc9937fa-0435-7664-a73a-c9bfa803e50e
device ( RO): eth3
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): e7a75876-ee65-950e-7975-6751eca3795b
uuid ( RO) : 3a5ef383-650a-ded9-d636-4c86a6831443
device ( RO): eth1
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): bd91ea1e-6184-4f7b-6360-0134f39b9751
uuid ( RO) : 4c04ef06-9707-67ac-1859-6e6617d507a7
device ( RO): eth2
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): 8d829397-e8d1-fdc2-b62d-8b23cf6da7dd
uuid ( RO) : 41b55f45-91ff-90e1-0a13-dbb680e744e9
device ( RO): eth0
currently-attached ( RO): true
VLAN ( RO): -1
network-uuid ( RO): 78613a9f-aede-edc6-39f4-40c4c5883de2
uuid ( RO) : 72ff5545-3d4b-5038-aa15-dc93998b8dab
device ( RO): eth0
currently-attached ( RO): true
VLAN ( RO): 21
network-uuid ( RO): 8310ea88-dad4-c989-19db-5c5fdb8d3edc
Check VM to attach new interface:
we need to know number of devices and vm-uuid.
[root@xenserver1 ~]# xe vm-list
uuid ( RO) : 68ce65a4-01ec-4a23-9016-011aa20e59cf
name-label ( RW): Control domain on host: xenserver1
power-state ( RO): running
uuid ( RO) : 66a6fcc2-b5b9-1eb9-cd26-c26d8df1e204
name-label ( RW): Hadoop-master
power-state ( RO): running
uuid ( RO) : a79bc6f8-54d7-a562-ba14-4f50db2efc9b
name-label ( RW): FreeBSD 9.2
power-state ( RO): running
uuid ( RO) : 8ac1c052-8448-6d9b-0a55-6e91e5be406c
name-label ( RW): FreeBSD10
power-state ( RO): halted
uuid ( RO) : 03070e1e-2b04-5e4b-87f9-5db7d69131bb
name-label ( RW): Hadoop-slave2
power-state ( RO): running
uuid ( RO) : d122b3bf-e914-83b0-5761-1430f205fa9c
name-label ( RW): Hadoop-slave1
power-state ( RO): running
[root@xenserver1 ~]# xe vif-list vm-name-label=FreeBSD\ 9.2
uuid ( RO) : 49a107e2-0e81-a9dd-0595-218c07fe1af8
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 2
network-uuid ( RO): 56d7fd62-ba47-c12c-e371-bc7908739ad1
uuid ( RO) : 03932dbf-d7e4-ed7d-d649-ac431a97d962
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 1
network-uuid ( RO): 8310ea88-dad4-c989-19db-5c5fdb8d3edc
Attach interface to VM:
[root@xenserver1 ~]# xe vif-create network-uuid=d5b6969c-eff4-79b2-0088-7740f8a9b492 vm-uuid=a79bc6f8-54d7-a562-ba14-4f50db2efc9b device=3 mac=random
758cf24a-2904-f3aa-8ed4-17d6ffebf032
[root@xenserver1 ~]# xe vif-create network-uuid=919b5b1c-201f-fed2-c39d-21946f278bdc vm-uuid=a79bc6f8-54d7-a562-ba14-4f50db2efc9b device=4 mac=random
3504d19f-2413-e066-6d30-1878adfbd117
Result:
[root@xenserver1 ~]# xe vif-list vm-name-label=FreeBSD\ 9.2
uuid ( RO) : 49a107e2-0e81-a9dd-0595-218c07fe1af8
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 2
network-uuid ( RO): 56d7fd62-ba47-c12c-e371-bc7908739ad1
uuid ( RO) : 758cf24a-2904-f3aa-8ed4-17d6ffebf032
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 3
network-uuid ( RO): d5b6969c-eff4-79b2-0088-7740f8a9b492
uuid ( RO) : 03932dbf-d7e4-ed7d-d649-ac431a97d962
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 1
network-uuid ( RO): 8310ea88-dad4-c989-19db-5c5fdb8d3edc
uuid ( RO) : 3504d19f-2413-e066-6d30-1878adfbd117
vm-uuid ( RO): a79bc6f8-54d7-a562-ba14-4f50db2efc9b
device ( RO): 4
network-uuid ( RO): 919b5b1c-201f-fed2-c39d-21946f278bdc
Depends of configuration probably you'll need to shutdown your machine and start it again thus system could determine network interface.
