I am setting up some bandwidth monitoring on a 3550-24 with the latest EMI image installed. The problem I have run into is monitoring ifInOctets and ifOutOctets on VLAN interfaces. Octet counts on physical interfaces are correct, but the counts on the VLAN interfaces are inaccurate
On this switch:
ifindex 1-24 : fa0/1-fa0/24
ifindex25-26: ge0/1 - ge0/2
ifindex 27: null0
ifindex28-32: Correspond to VLAN1 - VLAN5
Vlan 1 Native Vlan (172.31.254.x)
Vlan 2 Server/Wks (172.31.1.x)
Vlan 3 Internet (172.31.2.x)
Vlan 4 Wks (172.31.3.x)
Vlan 5 Wks (10.10.1.x)
From my testing here is what I found.
1) Interface fa0/1 (vlan2) is connected to the inside interface of a pix515
2) if I start a large download, I monitor the ifinoctetes/ifoutoctets of the pix firewall (172.31.2.253) and get accurate data
3) I monitor the same stats for fa0/1 (physical port on the 3550) and I get the same statistics as what i am pulling from the pix
4) The workstation that is doing the download is on Vlan 5 (10.10.1.1)
5) If I monitor the physical port the workstation is attached to, I get the same statistics as the pix and fa0/1
6) if i monitor the stats for both Vlan 3 (internet) and Vlan 5 (wks), their is less than 1 percent of the octet count as represented by monitoring the physical port
I have tried this on two 3550 switches and have come up with the same problem.
For example. If I monitor the "PHYSICAL" port (fe0/5) with the following MIB, I get accurate data.
SNMP: OID = 184.108.40.206.220.127.116.11.1.10.5
SNMP: OID = 18.104.22.168.22.214.171.124.1.16.5
But, If I monitor the VIRTUAL port (VLAN5), I get inaccurate octet counts.
SNMP: OID = 126.96.36.199.188.8.131.52.1.10.32
SNMP: OID = 184.108.40.206.220.127.116.11.1.16.32
Octet counts on physical ports are accurate.
Octet counts on virtual (VLAN) ports are inaccurate
If I track data coming in on a physical port (Vlan3) and route it to another port (vlan5). I can see the accurate octet counts on the physical ports, but do NOT see the octet counts reflected on the virtual VLAN ports.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.