By:
On:
In: automation
With: 0 Comments

In Configure RMON Alarms&Events by script I’ve shown a short python-algorithm to to discover all Cisco class-based QoS (cbQoS) packet-/drop-counters and to generate RMON-alarms for each. The router monitors these counters every 300s, calculates the delta for the interval and raises RMON-events when there were packets/drops or when the have been before but not anymore. This RMON-event has been configured as an syslog-message to an syslog-receiver etc. The existing script just generated a list of cli-commands which had to be entered manually to the router-config. Not a valid aproach when having hundreds devices to be configured. Now i want the script to automatically configure theRead More →

By:
On:
In: automation
With: 0 Comments

Getting back to the original task.. Use a script on a centralized Controller-VM to figure out for which SNMP-OID RMON-Alarms should get configured Get all current QoS-Drop-Counters, check the traffic-direction to monitor only outbount-queues, generate RMON-Alarms. Example Output: Todo: Verify existing RMON-Alarm/Event-Configuration at the device Todo: Push the config automatically to the deviceRead More →

By:
On:
In: automation
With: 0 Comments

Today I’ll show how retrieve additional details from already discoverd QoS-Counters. They are mostly descriptive, for human eyes. The „Traffic-Direction“-Attribute might be relevant since in most cases only outbound drop-counters might be interesting, so the discovered list of OIDs could get filtered to process only those outbound OIDs. Refresh: Retrieve all „QoS Packet-Counters“ There are two Policy-Objects #P: Policy #18 Policy #34 Both Policy-Objects contain three Traffic-Classes #Q: Class #65535 Class #131072 Class #196608 Attributes of a bound Policy #P Each Policy has at least two attributes: Interface-Type of the Policy (5 : CoPP) 1:mainInterface 2:subInterface 3:frDLCI 4:atmPVC 5:controlPlane 6:vlanPort 7:evc Traffic-Direction 1:input 2:output InterfaceRead More →

By:
On:
In: automation
With: 0 Comments

Discover the OIDs representing the counter-values of all active traffic-classes Ciscos „SNMP Object Navigator“ (http://mibs.cloudapps.cisco.com/ITDIT/MIBS/servlet/index) is our friend to get the base-OID when you know the name of the MIB: Object-NAME <=> Object-ID (OID) „cbQosCMStatsEntry“ <=> „1.3.6.1.4.1.9.9.166.1.15.1.1“ Each object is a set of all counters from „show policy-map interface“-command, the Object Navigator documents the ID of these counters, too.Read More →

By:
On:
In: automation
With: 0 Comments

RMON Refresher Think about this given Router-Configuration: Three Queues at interface Gig1: CM_VOIP_RTP CM_VOIP_CTRL class-default with per-Queue-Statistics: Packet counters Drop-counters etc. In these first examples, i don’t want to wait for queue-drops, i’ll just generate DSCP=EF-Traffic by the ping-command and watch the Queue-Packet-Counters, not Drops. Configure RMON Alarms and Events I’ll add two RMON-Events event #10 = rising-threshold – in my example: >1 Packet has been dropped forwarded event #11 = the falling-threshold – no packets have been… Than, instruct the Router to have a look at a QoS-counter: In the upcoming post I’ll discover the RMON-MIB to illustrate where the „enterprise.9….65536“-Parameter comes from. ThisRead More →

By:
On:
In: automation
With: 0 Comments

Stop frequent polling of everything, please! Last week I had to troubleshoot a network of a customer which was overwhelmed with SNMP-Queries – it wasn’t the first one. All Switch- and Router-CPUs have been at high level, since every tiny counter was polled at high rate. To provide real-time graphs to the top-level-management. Which hopefully don’t waste time to watch these colourful pictures all day for entertainment purposes. Doesn’t anybody remember RMON? Years ago I’ve been teaching routing&switching-classes as a full-time Cisco/BayNetworks/Fluke-instructor, and in every switching class there was a brief explanation about SNMP. And about RMON. RFC2819 – RMON (Remote Network Monitoring) MIB 4Read More →