Cisco Nexus 1000V - VEM Multicast Debugging

25-17
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
Chapter 25 VXLANs
VEM Multicast Debugging
• VEM1: Verify VXLAN ecapsulation.
vemlog debug sflisp all
vemlog debug sfvnsegment all
• VEM1: Verify that the remote IP address is learned:
vemcmd show l2 bd-name segbdname
If the remote IP is not learned, packets are sent multicast encapsulated.
• VEM1: Verify encapsulated packets go out or a uplink.
Use the vemcmd show vxlan-encap ltl ltl command to find out which uplink is being used.
vempkt capture egress ltl uplink
• VEM1: Look at statistics for any failures.
vemcmd show vxlan-stats all
vemcmd show vxlan-stats ltl veth/vxlanVTEP
• VEM2: Verify encapsulated packets are arriving on the uplink.
vempkt capture ingress ltl uplink
• VEM2: Verify VXLAN decapsulation.
vemlog debug sflisp all
vemlog debug sfvnsegment all
• VEM2: Verify decapsulated packets go out on a VXLAN vEthernet interface.
vempkt capture egress ltl vxlan_veth
• VEM2: Look at statistics for any failures:
vemcmd show vxlan-stats all
vemcmd show vxlan-stats ltl veth/vxlanVTEP
Use the following commands to debug the VXLAN packet path:
switch# module vem 4 execute vemlog debug vssnet all
switch# module vem 4 execute vemlog debug sfsched all
switch# module vem 4 execute vemlog debug sfport all
switch# module vem 4 execute vemlog debug sflisp all
switch# module vem 4 execute vemlog debug sfvnsegment all
Use the following commands to debug the VXLAN packet path from the VSM:
switch# module vem 4 execute vemdpalog debug if_bridge_rt all
switch# module vem 4 execute vemdpalog debug sfbd all
switch# module vem 4 execute vemdpalog debug sf_dp_threads all
switch# module vem 4 execute vemdpalog debug sfl2agent all
switch# module vem 4 execute vemlog debug sfporttable all
You can view the output for all the above logs by using the module vem 4 execute vemlog show all
command.
VEM Multicast Debugging
Use the following command to debug VEM multicast.