Cisco – How to Monitor Vlan Traffic

cisconmssnmpswitchvlan

We have migrated to a new ISP who provide us several services (Internet+VoIP+VoD) and have divided each service in one vlan 100,101,102 respectively.
Now I'm looking for a solution to monitor each service and measure the bandwidth on each vlan. I know we don't have counters on L3 SVI interface.
I though the port-channel sub-interface have counters operational but don't.

We receive on 4500-X the 3 vlans/services and trunk them to vlan 604 to CMTS. The vlan 260 is for IPTV Multicast.

In summary, I use cacti to monitor bandwidth on interface and I need a similar way to do it on vlans.

Maybe Netflow can solve the problem but before invest on it I would like yours considerations to found a simpler solution as Cacti.

Here the topology

============4500-X==================
!----------ingress - From ISP-----------------
sw-4500-X#sh run int te1/1/15 
Building configuration...

Current configuration : 171 bytes
!
interface TenGigabitEthernet1/1/15
 description Po from ISP 
 switchport trunk allowed vlan 100-102
 switchport mode trunk
 channel-group 5 mode active
end

sw-4500-X#sh run int te2/1/15
Building configuration...

Current configuration : 171 bytes
!
interface TenGigabitEthernet2/1/15
 description Po from ISP 
 switchport trunk allowed vlan 100-102
 switchport mode trunk
 channel-group 5 mode active
end

!----------egress port to CMTS------------------
sw-4500-X#sh run int te1/1/1
Building configuration...

Current configuration : 192 bytes
!
interface TenGigabitEthernet1/1/1
 description link Po1 -> CMTS (te2/0/0)
 switchport trunk allowed vlan 260,706
 switchport mode trunk
 load-interval 30
 channel-group 1 mode on
end

sw-4500-X#sh run int te2/1/1
Building configuration...

Current configuration : 192 bytes
!
interface TenGigabitEthernet2/1/1
 description link Po1 -> CMTS (te1/0/0)
 switchport trunk allowed vlan 260,706
 switchport mode trunk
 load-interval 30
 channel-group 1 mode on
end

EDIT :

Here the output of snmpwalk 

[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x> IF-MIB::ifName
....
IF-MIB::ifName.168 = STRING: VLAN-100  
IF-MIB::ifName.169 = STRING: VLAN-101   
IF-MIB::ifName.170 = STRING: Vl100  
IF-MIB::ifName.171 = STRING: VLAN-102  
IF-MIB::ifName.172 = STRING: Vl101  
IF-MIB::ifName.173 = STRING: Vl102  
...

[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x> IF-MIB::ifName.168
IF-MIB::    IFName.168 = STRING: VLAN-100
[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x>     IF-MIB::    IFHCInUcastPkts.168
IF-MIB::    IFHCInUcastPkts.168 = No Such Instance currently exists at this OID
[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x>     IF-MIB::    IFHCOutUcastPkts.168
IF-MIB::    IFHCOutUcastPkts.168 = No Such Instance currently exists at this OID
[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x>     IF-MIB::    IFHCInOctets.168
IF-MIB::    IFHCInOctets.168 = No Such Instance currently exists at this OID
[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x>     IF-MIB::    IFHCOutOctets.168
IF-MIB::    IFHCOutOctets.168 = No Such Instance currently exists at this OID

But if I try with .170 I get 

[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x> IF-MIB:ifHCInUcastPkts.170
IF-MIB::ifHCInUcastPkts.170 = Counter64: 0
[root@unix ~]# snmpwalk -v 2c -c rw_community <IP-4500-x> IF-MIB:ifHCOutOctets.170
IF-MIB::ifHCOutOctets.170 = Counter64: 325414481

This get me another question :
Why this difference in the same interface (VLAN-100 and Vl100) ??

My main question is still unanswered because the OID I get are for the packets and bytes counters on interface.

What I want to get is the Bandwidth measurement on some vlan. So far I only see Netflow as a probable solution.

EDIT2:

I'm trying to add on Cacti and I'm having some issue.

Graph showed when I add interface vlan100:

cacti

How to add such interface and made calculation to show right traffic graph ?? as suggested by Mike Pennington

Best Answer

Try adding the counter command under the SVI (see here for more information, specifically the "Understanding L3 interface counters" section).

For instance:

 Cisco#config t
 Cisco(config)#interface vlan 100
 Cisco(config-if)#counter ?
   ipv4  Enable IPv4 statistic counters
   ipv6  Enable IPv6 statistic counters
   <cr>
 Cisco(config-if)#counter
 Cisco(config-if)#end

Combined with Mike's excellent answers this will probably be what you want.

Related Topic