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AIX with 2 Net Interfaces lose connectivity


 
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Operating Systems AIX AIX with 2 Net Interfaces lose connectivity
# 1  
AIX with 2 Net Interfaces lose connectivity

hi guys

We have a AIX Server with TSM installed.
This server has en0 for administration purposes and we have en1 for backup stuff.

en0 subnet 10.10.10.x
en1 subnet 10.10.20.x

The issue we are having is all of a sudden the LPARs we are backing up lose connectivity to the AIX-TSM Server. for example
en1 ip is 10.10.20.10 and a TSM LPAR client that we are backing up is 10.10.20.11

Backup fails and we found that LPAR client 10.10.20.11 won't ping 10.10.20.10, but if go to the AIX-TSM server ping works and ping from LPAR client is back.

It's like ping from the AIX-TSM box reactivates connectivity.

Something important to mention we found the problem making backups but today we were doing to test and the connectivity is gone doing nothing and pinging from AIX-TSM server to LPAR Clients reactivates it

Anyone has seen an issue like this?

en0 is always fine

thanks a lot
# 2  
This sounds quite strange.

First, do you have a VIOS or are you using HEAs in your LPAR?

Second, do you have any "energy saving" enabled in your system profiles? Believe it or not, there is such a thing and the hardware might find it worthwhile to switch off a (seemingly) adapter to conserve energy.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
# 3  
well I forgot to mention this is a Power 701, where I installed AIX 7.1 there is not VIO.

and second LPARs are in Pureflex this is a p260 Power server which have Etherchannel configured and on this server I have VIO 2.2.3

LPARs have 2 virtual nics as well, administration NIC is always OK, is the backups network / interfaces which lose connectivity

AIX-TSM Server
en0 - 10.10.10.x GW: 10.10.10.1
en1 - 10.10.20.x

LPAR
en0 10.10.11.x
en1 - 10.10.20.x

LPAR loses connectivity to en1 IP, BTW I've tested en2 same issue
# 4  
found something, in this pureflex I have also Intel servers with Vmware which host some Windows VMs, I configure a Windows VM in the same VLAN and the Windows VM does not lose connectivity to the AIX-TSM IP.

Something else I found doing some more testing If I change the IP to the AIX-TSM server AIX LPARs won't ping

for example

AIX-TSM Server IP 10.10.20.10 If I change it to 10.10.20.30 LPARs AIX won't ping now Windows VM pings without any problem
to get AIX LPARs ping I have to go to the AIX-TSM server and ping any ip in the 10.10.20.x segment

so far looks like AIX issue...?
should I add a static route or something? but the thing is the AIX I am testing right now only have one interface in the 10.10.20.x segment not like the production LPARs

thanks
# 5  
How many default gateways are configured?

Can you paste the output of netstat -nr
# 6  
Quote:
Originally Posted by ibmtech
How many default gateways are configured?

Can you paste the output of netstat -nr

like I said I configured an extra AIX LPAR just for testing using just one nic interface not 2 like the others LPARs being backed up.

this AIX LPAR for testing is 10.10.20.16 and this is the command you are looking for

Code:
# netstat -nr                                                                      
Routing tables                                                                     
Destination        Gateway           Flags   Refs     Use  If   Exp  Groups        
                                                                                   
Route Tree for Protocol Family 2 (Internet):                                       
10.10.20.0          10.10.20.16        UHSb      0         0 en0      -      -   =>  
10.10.20/24         10.10.20.16        U         0     18306 en0      -      -       
10.10.20.16         127.0.0.1         UGHS      0       670 lo0      -      -       
10.10.20.255        10.10.20.16        UHSb      2      1172 en0      -      -       
127/8              127.0.0.1         U         6    184693 lo0      -      -       
                                                                                   
Route Tree for Protocol Family 24 (Internet v6):                                   
::1%1              ::1%1             UH        1     14560 lo0      -      -

but the way VIO in my p260 and AIX-TSM Power 701 are using etherchannel.

but just to let you know I removed etherchannel in Power 701 to test more and same issue I am not able to remove the etherchannel in the p260 since is Production and I am sure network 10.10.10.x has been working fine for quite some time
# 7  
Where is the default gateway in here? I see 10.10.20.16 as en0 interface IP.
I feel its an issue of gateway.

Ok run this and paste the output.

lsattr -El inet0 | grep route

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