09-19-2012 05:49 AM - edited 03-07-2019 08:57 AM
My company is composed of three different campuses, all with a similar network topology. We currently are experiencing high bandwidth on our serial interface at one of the campuses in particular. The network is composed of about 20 VLANS routed internally using a Cisco 6509. Traffic to the outside is PAT’d by an ASA 5510 and then forwarded through our edge router interface. Each VLAN is PAT’d to a specific public address.
Due to the PAT, how would you recommend determining what specific private addresses are consuming our resources on the serial interface. When I look at our NMS, it reports the public address, but that only narrows it down to a VLAN. For example, all the devices in VLAN 6 are translated to 146.34.118.245, and 146.34.11.245 is a top talker.
computer --> 2960-s (access) --> 6509 (L3 Switch) --> ASA 5510 (PAT) --> 3845 (gateway)----> Internet
Any recommendations or thoughts would be appreciated.
09-19-2012 06:27 AM
Hello Onerishpollack,
you can think of enabling netflow on the C6500 L3 switch and more specifically in ingress direction on the SVI Vlan 6.
Depending on IOS version on C6500 you can enable netflow selectively or only globally
see
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/nde.html
>>Cisco IOS Release 12.2(33)SXH and later releases support per-interface NetFlow, which enables PFC NetFlow data collection on a per-interface basis. With releases earlier than Release 12.2(33)SXH, NetFlow on the PFC could be only be enabled and disabled globally.
Once netflow is enabled on the involved SVI you can export flow accounting data to a Netflow Collector server or you can use
show ip cache flow
to visualize the flow cache locally on the C6500.
see
Once you get the output of the show ip cache flow you can put it in a txt or csv file and you can aggregate ( sum ) all flows with the same source IP address and you can find the top talkers.
Hope to help
Giuseppe
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide