Learn APA configuration in HPUX. Auto port aggregation logic is similar to network teaming in Linux. Used for network card hardware-level redundancy.
APA stands for Auto Port aggregation. It is software i.e. operating system level configuration which offers NIC (Network Interface Card also referred to as LAN card) redundancy. We have already briefed about APA in this post, refer to the first paragraph.
Also read : Network bonding-teaming in Linux
Let’s run down to configuration steps for APA in HPUX in failover group mode.
You need to have teaming software installed on your system. The Teaming (Auto PORT Aggregation) application is inbuild in HP-UX 11i V2 EOE. If not you can download it from the HP software repository and install it on your HPUX server.
Make sure your primary network interface card (NIC) is configured with a proper IP address, mask, and gateway. Use
netstat -in command.
# ioscan -funC lan Class I H/W Path Driver S/W State H/W Type Description =================================================================== lan 1 1/1/0 gelan CLAIMED INTERFACE HP A4926A PCI 1000Base-SX Adapter /dev/gelan4
Let’s assume we have identified
lan1 as a secondary NIC for our config.
lan0 being the primary one.
Secondly, identify your second NIC which can be used as secondary card in APA configuration (Use
ioscan -fnClan command). Make sure this card is connected to a different network switch, configured with the same VLAN as primary on the network end, and is physical does not reside in the same hardware module of primary NIC. This ensures high availability in case of network, switch, or card hardware failure.
To confirm both cards have same network reachability (i.e. on same VLAN) use below command :
# linkloop -i PPA_pri StationAddr_sec # linkloop -i 1 0x00108323463C Link connectivity to LAN station: 0x00108323463C -- OK ---- failure output means no connectivity---- Link connectivity to LAN station: 0x00108323463C error: get_msg2 getmsg failed, errno = 4 -- FAILED frames sent : 1 frames received correctly : 0 reads that timed out : 1
where station address is MAC (can be obtained from
lanscan output) and PPA number is
lan1 number. Try in both ways. using MAC of primary and PPA of secondary and vice versa to make sure you have connectivity between both cards. If you get shown failed error then those two cards cant be used in APA config together.
Edit configuration file
/etc/rc.config.d/hp_apaportconf and mention interface names (
lan1 in our case) like below:
HP_APAPORT_INTERFACE_NAME=lan0 HP_APAPORT_CONFIG_MODE=LAN_MONITOR HP_APAPORT_INTERFACE_NAME=lan1 HP_APAPORT_CONFIG_MODE=LAN_MONITOR
Start APA services.
# /sbin/init.d/hpapa start /sbin/init.d/hpapa started. Please be patient. This may take about 40 seconds. HP_APA_DEFAULT_PORT_MODE = MANUAL /usr/sbin/hp_apa_util -S 0 LAN_MONITOR /usr/sbin/hp_apa_util -S 1 LAN_MONITOR /sbin/init.d/hpapa Completed successfully. # /sbin/init.d/hplm start
Now, we will create a LAN configuration file that can be applied later to both NIC to make them aware they are working in a group under the same IP umbrella.
lanqueryconf command creates ASCII file at
# lanqueryconf -s # more /etc/lanmon/lanconfig.ascii NODE_NAME teststation POLLING_INTERVAL 10000000 DEAD_COUNT 3 FAILOVER_GROUP lan900 STATIONARY_IP 10.10.2.5 PRIMARY lan0 5 STANDBY lan1 3
See the content of this ASCII file. It has node name, polling interval (microseconds, default is 10 sec). The dead count is the number of polling packets missed to consider failure and initiate failover (default is 3). The failover group is lan name which will be visible systemwide.
lan900 will have our primary NIC address and
lan0, lan1 will work together as
lan900. IP is IP taken up by
lan0 will be treated as primary NIC and lan1 as standby. Number 5,3 denotes priorities of respective NIC.
You can make changes in this file if you dont want to go with default values.
The above file is generated for admin to edit if any changes required. After that, the file will be checked for integrity and then can be applied to APA configuration like below :
# lancheckconf Reading ASCII file /etc/lanmon/lanconfig.ascii Verification of input file /etc/lanmon/lanconfig.ascii is complete. # lanapplyconf Reading ASCII file /etc/lanmon/lanconfig.ascii Creating Fail-Over Group lan900 Updated binary file /etc/lanmon/lanconfig
lan900 is created and you APA is complete.
Now you can see
lan1 vanish from
lanscan -q output and instead
lan900 appeared with 0 and 1 as its members.
# lanscan -q 2 3 900 0 1 901
You can verify that
lan900 will have an IP address which was configured on primary NIC
lan0 before configuration (in
netstat -in output).
You can even test if APA failover is happening correctly. Follow this testing procedure to make sure your APA works properly. Sometimes
lan900 won’t appear and you need to restart your system. The rebooting system takes up a new APA configuration and you will able to see
lan900 in action.
If there is more than one APA configured on the system then it will follow the series of
lan902, and so on.
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