Medianet Reference Guide - Cisco

Chapter 6
Medianet Management and Visibility Design Considerations
Cisco Network Analysis Module
traceroute output. However, note that a video traffic session (consisting of a source IP address and a
destination IP address) that is Cisco Express Forwarding-switched through the router follows one or the
other first hop through me-westdist-3 or me-westdist-4, and not both hops, as indicated within the
traceroute output. Again, the use of the show ip cef exact-route command on switches along the path
may be necessary to determine the exact route of the video flows.
show interface summary and show interface Commands
After you have discovered the path of the actual video stream, possibly from using a combination of
traceroute and the show ip cef exact-route command on switches along the path, a next logical step in
troubleshooting a video quality issue is to see at a very high level whether interfaces are dropping
packets. The show interface summary command can be used on Cisco Catalyst switch and IOS router
platforms for this purpose (note that this command is not supported on Cisco Nexus switch platforms).
Example 6-13 shows an example output from this command on a Cisco Catalyst 6500 platform.
Example 6-13 Partial Output from the show interface summary Command on a Cisco Catalyst 6500
Switch
me-westcore-1#show interface summary
*: interface is up
IHQ: pkts in input hold queue
OHQ: pkts in output hold queue
RXBS: rx rate (bits/sec)
TXBS: tx rate (bits/sec)
TRTL: throttle count
IQD: pkts dropped from input queue
OQD: pkts dropped from output queue
RXPS: rx rate (pkts/sec)
TXPS: tx rate (pkts/sec)
Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
------------------------------------------------------------------------------------------
Vlan1 0 0 0 0 0 0 0 0 0
* GigabitEthernet1/1 0 0 0 0 1000 1 0 0 0
GigabitEthernet1/2 0 0 0 0 0 0 0 0 0
...
* TenGigabitEthernet3/1 0 0 0 0 1000 1 2000 1 0
* TenGigabitEthernet3/2 0 0 0 0 1000 1 1000 1 0
TenGigabitEthernet3/3 0 0 0 0 0 0 0 0 0
TenGigabitEthernet3/4 0 0 0 0 0 0 0 0 0
* GigabitEthernet5/1 00 0 0 1000 1 2000 3 0
* GigabitEthernet5/2 00 0 0 2000 2 0 0 0
* Loopback0 0 0 0 0 0 0 0 0 0
The show interface summary command can be used to quickly identify the following:
• Which interfaces are up on the switch or router, as indicated by the asterisk next to the interface
• Whether any interfaces are experiencing any input queue drops (IQD) or output queue drops (OQD)
• The amount of traffic transmitted by the interface in terms of bits/second (TXBS) or packets/second
(TXPS)
• The amount of traffic received by the interface in terms of bits/second (RXBS) or packets/second
(RXPS)
The show interface summary command may need to be run multiple times over a short time interval to
determine whether drops are currently occurring, rather than having occurred previously. Alternatively,
the clear counters command can typically be used to clear all the counters on all the interfaces.
OL-22201-01
Medianet Reference Guide
6-43