Documenting malformed and unexpected packets
If the manufacturer of the routing application cannot
provide documentation that indicates that it is sending the malformed
or unexpected packets that are being received by OMPROUTE , the following
documentation is available for initial diagnosis.
- A network sniffer trace.
- The data set that contains the IP packet trace (SYSTCPDA), unless the packet trace is being redirected to the TCP/IP address space. See TCP/IP services traces and IPCS support for more information.
- The data set that contains OMPROUTE trace and debug information. If OMPROUTE trace and debug information is being redirected to the OMPROUTE CTRACE internal buffer, this buffer is included in a dump of the OMPROUTE address space. See OMPROUTE traces and debug information for more information.
- Output from the appropriate OMPROUTE DISPLAY commands as described in z/OS Communications Server: IP System Administrator's Commands.
If the malformed or unexpected packets that are being
received are IPv4 OSPF packets, use the following commands to display
your IPV4 OSPF interfaces and neighbors:
- DISPLAY TCPIP,,OMPROUTE,OSPF, INTERFACES
- DISPLAY TCPIP,,OMPROUTE,OSPF, INTERFACE,NAME=if_name
- DISPLAY TCPIP,,OMPROUTE,OSPF,NEIGHBOR
- DISPLAY TCPIP,,OMPROUTE,OSPF,NEIGHBOR,IPADDR=ip-addr
If the malformed or unexpected packets that are being
received are IPv6 OSPF packets, use the following commands to display
your IPv6 OSPF interfaces and neighbors:
- DISPLAY TCPIP,,OMPROUTE,IPV6OSPF, INTERFACES
- DISPLAY TCPIP,,OMPROUTE,IPV6OSPF, INTERFACE,NAME=if_name Note: ID=if-id can be used instead of NAME=if_name
- DISPLAY TCPIP,,OMPROUTE,IPV6OSPF,NEIGHBOR
- DISPLAY TCPIP,,OMPROUTE,IPV6OSPF,NEIGHBOR,ID=router-idNote: Specify IFNAME=if_name if the neighbor that is specified by the ID parameter has more than one neighbor relationship with OMPROUTE (for example if there are multiple IPv6 OSPF interfaces that connect OMPROUTE to the neighbor).
When applicable, you can use a SLIP on the OMPROUTE error message that is reporting the receipt of the malformed or unexpected packet to capture the OMPROUTE trace and debug information and the dump of the TCP/IP address space that contains the IP packet trace at the time of the error.