Instance Fails to Start With "ORA-27303: additional information: requested interface eth1 mixed MTU configured" in Multiple cluster_interconnect Environment (Doc ID 1394936.1)

Last updated on SEPTEMBER 25, 2023

Applies to:

Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

Multiple private network configured as cluster interconnect:

oifcfg getif
eth0 130.1.1.0 global public
eth2 10.0.x.0 global cluster_interconnect
eth1 10.y.z.0 global cluster_interconnect

ASM instance startup fail with this error:

ORA-27504: IPC error creating OSD context
ORA-27300: OS system dependent operation:if MTU failed with status: 0
ORA-27301: OS failure message: Error 0
ORA-27302: failure occurred at: skgxpcini2
ORA-27303: additional information: requested interface eth1 mixed MTU configured 9000 1500
Check output from ifconfig command

ifconfig -a

eth1      Link encap:Ethernet HWaddr 00:19:B9:F5:FF:66
          inet addr:10.y.z.202 Bcast:10.y.z.255 Mask:255.255.255.0
          inet6 addr: fe80::219:b9ff:fef5:ff66/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:192 (192.0 b) TX bytes:7676 (7.4 KiB)
          Interrupt:169 Memory:f4000000-f4012100

eth2      Link encap:Ethernet HWaddr 00:15:C5:F8:C5:EA
          inet addr:10.0.x.173 Bcast:10.0.x.255 Mask:255.255.255.0
          inet6 addr: fe80::215:c5ff:fef8:c5ea/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
          RX packets:208370 errors:0 dropped:0 overruns:0 frame:0
          TX packets:232594 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:110779096 (105.6 MiB) TX bytes:42152352 (40.1 MiB)
          Base address:0xecc0 Memory:f3ee0000-f3f00000

Note: MTU is different on eth1 and eth2

Cause

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Instance Fails to Start With "ORA-27303: additional information: requested interface eth1 mixed MTU configured" in Multiple cluster_interconnect Environment (Doc ID 1394936.1)

Applies to:

Symptoms

Cause

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