Overview
For troubleshooting and to better understand the network and it’s behaviour,
it’s always handy to have access to Ping. On the ACI devices there is a regular Ping
as well, but it’s limited to the management VRF. So for troubleshooting in the
underlay, with l3 outs, in customer VRFs and so on, you can leverage iPing in
Cisco’s ACI.
iPing allows you to ping directly from your Leafs, into the Overlay networks
that are connected to them.
iPing
Thankfully there isn’t too much of a difference from a regular Ping to iPing.
What you need to know is the VRF you want to ping in. The correct name (Cisco
stitches the tenant + VRF together) can be obtained through show vrf.
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SPINE101# show vrf
VRF-Name VRF-ID State Reason
black-hole 3 Up --
management 2 Up --
mgmt:inb 5 Up --
overlay-1 4 Up --
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The output looks like that, in a production fabric you will probably have a bit
more VRFs. Let’s assume we want to ping in the overlay-1 VRF, which is used
for the communication between all the ACI nodes.
Basic syntax is iping -V <VRF> <IP>, example iping -V overlay-1 100.111.184.65.
Just remember the capital -V and you are good to go with iPing :)
Full output:
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SPINE101# iping -V overlay-1 100.111.184.65
PING 100.111.184.65 (100.111.184.65) from 100.111.184.66: 56 data bytes
64 bytes from 100.111.184.65: icmp_seq=0 ttl=63 time=0.357 ms
64 bytes from 100.111.184.65: icmp_seq=1 ttl=63 time=0.359 ms
64 bytes from 100.111.184.65: icmp_seq=2 ttl=63 time=0.292 ms
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More options with iPing
There are additional options as well. -c, -i, -F and -s can be helpful
to do advanced troubleshooting.
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usage: iping [ -d set the SO_DEBUG option]
[ -D enable debug information ]
[ -F enable do not fragment bit in IP header ]
[ -L receive packets on supplied interface ]
[ -n enable printing host IP address than resolved name ]
[ -q quiet output ]
[ -r disable routing of the packets, send only to directly connected hosts ]
[ -v output in verbose format ]
[ -V <vrf-name> name of the VRF through which destination is reachable ]
[ -c <count> no of packets to send ]
[ -i <wait> no of seconds to wait before sending next packet ]
[ -p <pattern> packet payload pattern ]
[ -s <packetsize> size of packets to send ]
[ -t <timeout> wait for seconds to receive reply ]
[ -S <source ip/interface> send packet with given source-ip or IP of given interface and
send packet out of that interface ]
<host> destination host-name or ip address
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