Enabling a MIB for QoS

lamav · ‎12-09-2009

Correct me of Im wrong, but whenever one enables a certain technology or protocol on a Cisco device, the option exists to monitor the behavior through SNMP.

The example I am concerned with in particular is MQC QoS.

I have read in many documents that Cisco has an SNMP MIB for MQC QoS, but how does one go about enabling that MIB so that an NMS station can leverage it to monitor....

I would think that one would have to enable the traps under the "snmp-server" set of congiurations, but no matter what version of code I use to check, there is never an option for enabling MQC QoS traps, even though the technology is configurable on the device.

Example:

3#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3(config)#snmp-server enable traps ?
alarms            Enable SNMP alarms traps
atm               Enable SNMP atm traps
bgp               Enable BGP traps
bridge            Enable SNMP STP Bridge MIB traps
bulkstat          Enable Data-Collection-MIB Collection notifications
c6kxbar           Enable SNMP CISCO-CAT6K-CROSSBAR-MIB traps
call-home         Enable SNMP CISCO-CALLHOME-MIB traps
casa              Enable SNMP casa traps
cef               Enable SNMP CEF traps
chassis           Enable SNMP chassis traps
config            Enable SNMP config traps
config-copy       Enable SNMP config-copy traps
config-ctid       Enable SNMP config-ctid traps
cpu               Allow cpu related traps
csg               Enable SNMP CSG traps
dhcp              Enable SNMP dhcp traps
dot1x             Enable SNMP dot1x traps
ds1               Enable SNMP DS1 traps
eigrp             Enable SNMP EIGRP traps
entity            Enable SNMP entity traps
envmon            Enable SNMP environmental monitor traps
ether-oam         Enable SNMP ethernet oam traps
ethernet          Enable SNMP Ethernet traps
event-manager     Enable SNMP Embedded Event Manager traps
flash             Enable SNMP FLASH notifications
flex-links        Enable SNMP FLEX Links traps
frame-relay       Enable SNMP frame-relay traps
fru-ctrl          Enable SNMP entity FRU control traps
hsrp              Enable SNMP HSRP traps
ipmulticast       Enable SNMP ipmulticast traps
ipsec             Enable IPsec traps
isakmp            Enable ISAKMP traps traps
isis              Enable IS-IS traps
l2tun             Enable SNMP L2 tunnel protocol traps
mac-notification Enable SNMP MAC Notification traps
memory            Enable SNMP Memory traps
module            Enable SNMP module traps
mpls              Enable SNMP MPLS traps
msdp              Enable SNMP MSDP traps
mvpn              Enable Multicast Virtual Private Networks traps
ospf              Enable OSPF traps
pim               Enable SNMP PIM traps
port-security     Enable SNMP port security traps
pppoe             Enable SNMP pppoe traps
pw                Enable SNMP PW traps
rep               Enable SNMP Resilient Ethernet Protocol Traps
resource-policy   Enable CISCO-ERM-MIB notifications
rf                Enable all SNMP traps defined in CISCO-RF-MIB
rsvp              Enable RSVP flow change traps
rtr               Enable SNMP Response Time Reporter traps
slb               Enable SNMP SLB traps
snmp              Enable SNMP traps
sonet             Enable SNMP SONET traps
stpx              Enable SNMP STPX MIB traps
syslog            Enable SNMP syslog traps
transceiver       Enable SNMP transceiver traps
tty               Enable TCP connection traps
vlan-mac-limit    Enable SNMP L2 Control VLAN MAC Limit notifications
vlancreate        Enable SNMP VLAN created traps
vlandelete        Enable SNMP VLAN deleted traps
vtp               Enable SNMP VTP traps
<cr>

3(config)#snmp-server enable traps

Thanks

luijimen · ‎12-14-2009

Hi,

The first thing to do to enable SNMP, is to configure a community string (for SNMPv2c and SNMPv1). Most platforms accept the following command:

# snmp-server community test ro

where, 'test' is the community name and 'ro' stands for read-only. More info on the IOS syntax is here:

http://www.cisco.com/en/US/docs/ios/netmgmt/command/reference/nm_17.html#wp1102590

Some SNMP setup configuration examples can be found here as well:

http://www.cisco.com/en/US/docs/ios/12_2/configfun/configuration/guide/fcf014.html#wp1001599

Now, for the QoS functionality, it is mostly kept inside the CISCO-CLASS-BASED-QOS-MIB (.1.3.6.1.4.1.9.9.166).

Once your device is enabled for SNMP access, you should be able to query the MIB above for some QoS information.

The amount of data in this mib is quite large, so it basically depends on what information you want to get.

For example:


cbQosServicePolicyTable gets you: the interfaces/media types and the policymap that are attached to it.
cbQosATMPVCPolicyTable gets you: the policies that are attached to a ATM PVC.
cbQosPolicyMapCfgTable gets you: the Policymap configuration information.

cbQosCMStatsTable gets you: ClassMap related Statistical information.
cbQosQueueingStatsTable gets you: Queueing Action related Statistical information.

So as you can see, there is a big amount of info you can get off your device for QoS.

Perhaps a CLI command used would help narrow down the objects needed.

Hope this helps.

Luis.

luijimen · ‎12-14-2009

Sorry, forgot to comment on the SNMP QoS traps. Unfortunately, there are no native QoS traps available at the moment.

However, RMON could be used to monitor specific OIDs in the CISCO-CLASS-BASED-QOS-MIB so an RMON trap can be sent whenever the value reaches a specified threshold.

Info on RMON config can be found here: http://www.cisco.com/en/US/docs/ios/netmgmt/configuration/guide/nm_cfg_rmon_sup_ps6350_TSD_Products_Configuration_Guide_Chapter.html