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ktstyle_52699's avatar
ktstyle_52699
Icon for Nimbostratus rankNimbostratus
Dec 09, 2012

MGMT port and last hop

Hi!     I see this good community of professionals. That's good.   We install in our network few clusters 6900 and 3900. With this equipment we use Checkpoint for Layer 3. Checkpoint use...
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Dr__W_97433's avatar
Dr__W_97433
Historic F5 Account
Dec 10, 2012
Hi ktstyle,

 

 

The mgmt port does not support Auto Last Hop because the mgmt port is controlled by the Linux kernel, and not the Traffic Management Microkernel (TMM), which essentially manages all of the switch interfaces. Also, the Linux kernel typically uses a separate default gateway than TMM and thus maintains a separate routing table for this purpose, aka "Management Routes". It is possible to use the "arp" command to create static ARP entries for the Linux kernel, and it is also possible to edit the kernel's routing table if for some reason ClusterXL VMAC is causing issues here:

 

 

SOL3669: Overview of management interface routing (9.x - 10.x)

 

https://support.f5.com/kb/en-us/solutions/public/3000/600/sol3669.html?sr=25931722

 

 

If you desire to take packet captures of your mgmt interface to help determine root cause of your icmp issue, use the following syntax on the BIG-IP as the root user:

 

To save a .cap file for Wireshark

 

tcpdump -ni eth0 -s0 host -w /var/tmp/mgmt_1.cap

 

To use STDOUT to troubleshoot ping

 

tcpdump -ni eth0 -e -s0 "host and (icmp or arp)"

 

 

Cheers,

 

Dr. W