nanog mailing list archives
Re: JUNIPER M7i CFLOW Sampling for L2 Vlans
From: Chris Tracy <ctracy () es net>
Date: Fri, 16 Apr 2010 12:12:12 -0400
It is possible to get cflow working in a L2 way ?
Hi Giuliano, The short answer is, unfortunately, no. NetFlow v5 does not have any fields for Layer 2 information: http://netflow.caligare.com/netflow_v5.htm Although NetFlow v9 does have such fields, you (a) only get NetFlow v9 functionality on a Juniper if you have a Services PIC installed and (b) are limited by the NetFlow v9 templates that JUNOS implements. See the section titled "Fields Included in Each Template Type" for a description of each NetFlow v9 template at http://www.juniper.net/techpubs/en_US/junos9.5/information-products/topic-collections/config-guide-services/services-configuring-flow-aggregation-to-use-version-9-flow-templates.html. Juniper supports sFlow (which would give you L2 info) on their EX switches, but not on their routers. Perhaps when/if IPFIX support comes along, you might be able to get what you are looking for. You could use port mirroring or an optical tap with various open-source tools running on a Unix host to do the kind of monitoring you are looking for. Cheers, -Chris On Apr 16, 2010, at 11:52 AM, GIULIANO (UOL) wrote:
People, Good afternoon, We have a curious situation in a client's environment. It has a M7i router with 2 IQ2E (4 GE) PICs. It wants one of its PICs plugged into a L2 switch (802.1Q Trunk Mode) and the another one plugged (via 1 giga of 4 ports only) to another L2 switch. M7i / \ S1 S2 Both Giga ports are simpled configured like: nterfaces { ge-0/0/0 { vlan-tagging; nterfaces { ge-0/1/0 { vlan-tagging; L2 Trunk Ethernet only without L3 configuration. It is possible to get flow information about the encapsulated vlans (10,20,30,40, etc) inside the trunk traffic ? ... without configuring ip (4 or 6) or creating vlan interfaces ? It is possible to get cflow working in a L2 way ? Does anyone has configured it before using JUNIPER ? Can you send or point to me some samples of configuration ? Thanks a lot, Giuliano
-- Chris Tracy <ctracy () es net> Energy Sciences Network (ESnet) Lawrence Berkeley National Laboratory
Current thread:
- JUNIPER M7i CFLOW Sampling for L2 Vlans GIULIANO (UOL) (Apr 16)
- Re: JUNIPER M7i CFLOW Sampling for L2 Vlans Chris Tracy (Apr 16)
- Re: JUNIPER M7i CFLOW Sampling for L2 Vlans Paolo Lucente (Apr 16)
- Re: JUNIPER M7i CFLOW Sampling for L2 Vlans Chris Tracy (Apr 16)