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RE: [nv-l] Slightly off the subject

To: "Mahesh Tailor" <MTailor@carilion.com>
Subject: RE: [nv-l] Slightly off the subject
From: "Geoffrey Cheng/Markham/IBM" <gcheng@ca.ibm.com>
Date: Thu, 14 Mar 2002 12:21:13 -0500
Cc: nv-l@lists.tivoli.com
Hi, Mahesh,

      The following information is cut&paste from Cisco white paper "Cisco
network monitoring and event correlation guidelines".
      which gives you the mib variables corresponding to "sh mac" on IOS.
The document can be obtained from http://www.cisco.com.
      (do a search)...

============================================================================================

Port Utilization, Broadcast, Multicast, and Unicast Ratios

A concern for network managers is the rate of broadcast traffic on switched
ports. Because broadcast traffic is forwarded to every port on a VLAN, you
can set up a "dummy" port as part of a VLAN and capture the only broadcast
traffic. Then you can compare the broadcast rate to the theoretical max
rate of the line.


SNMP MIBs


The following information is available at
http://www.cisco.com/public/mibs/v1/BRIDGE-MIB.my


·     dot1dTpPortInFrames?The number of frames that have been received by
this port from its segment; note that a frame received on the interface
corresponding to this port is counted by this object if and only if it is
for a protocol being processed by the local function, including bridge
management frames
·     dot1dTpPortOutFrames?The number of frames that have been transmitted
by this port to its segment; note that a frame transmitted on the interface
corresponding to this port is counted by this object if and only if it is
for a protocol being processed by the local bridging function, including
bridge management frames

The following information is available at
http://www.cisco.com/public/mibs/v1/IF-MIB-V1SMI.my


·     ifInMulticastPkts?The number of packets delivered by this sublayer to
a higher (sub)layer that were addressed to a multicast address at this
sublayer; for a MAC-layer protocol, this number includes both group and
functional addresses.
·     ifInBroadcastPkts ?The number of packets delivered by this sublayer
to a higher (sub)layer that were addressed to a broadcast address at this
sublayer
·     ifOutMulticastPkts?The total number of packets that higher-level
protocols requested to be transmitted, and that were addressed to a
multicast address at this sublayer, including those that were discarded or
not sent; for a MAC-layer protocol, this number includes both group and
functional addresses
·     ifOutBroadcastPkts?The total number of packets that higher-level
protocols requested to be transmitted, and that were addressed to a
broadcast address at this sublayer, including those that were discarded or
not sent

The following information is available at
http://www.cisco.com/public/mibs/v1/RMON-MIB.my


·     etherStatsBroadcastPkts?The total number of good packets received
that were directed to the broadcast address; note that this number does not
include multicast packets
·     etherStatsMulticastPkts?The total number of good packets received
that were directed to a multicast address; note that this number does not
include packets directed to the broadcast address

CLI

·     show mac?Displays MAC-level statistics such as received/transmitted
frames, received/ transmitted multicast packets, and received/transmitted
broadcast packets.

switch 5000 (enable)  show mac


MAC      Rcv-Frms   Xmit-Frms  Rcv-Multi  Xmit-Multi Rcv-Broad  Xmit-Broad
-------- ---------- ---------- ---------- ---------- ---------- ----------
 1/1              0          0          0          0          0          0
 1/2              0          0          0          0          0          0
 2/1        7564831    3159859      93795    2982015    7375010      47356
 2/2         839319   11317193      97413    2991019       1560    7417591
 2/3          40744   10516768       5631    3096045          6    7419192
 2/4          40989   10523185       6222    3102759          0    7419195
 2/5          87858   10577397       6179    3114275        920    7418557
 2/6              0          0          0          0          0          0
 2/7          53448   10557561       5632    3124050          0    7419181
 2/8        1646786   31124783    1645159   31124783          0          0
 2/9          45666   10610469       4980    3150899        543    7418652
 2/10         44872   10582388       5723    3158925        118    7417517
 2/11      24269744    8525203   24269742    1104787          0    7420184

Best Regards,

Geoffrey Cheng
Certified I/T Specialist, CCNP
Certified Tivoli Enterprise Consultant & Instructor
ITS, IBM Global Services
Prime Line: (416)-410-8874 Fax: (905)-316-4525
Email: gcheng@ca.ibm.com


"Mahesh Tailor" <MTailor@carilion.com> on 03/14/2002 10:00:35 AM

Please respond to "Mahesh Tailor" <MTailor@carilion.com>

To:    <donald.davis@firstcitizens.com>, <nv-l@lists.tivoli.com>
cc:
Subject:    RE: [nv-l] Slightly off the subject


Thanks, Don, but this is not the correct MIB variable.  It does not give
the same information.  What I am looking for is the table that gives the
MAC addresses of the devices that are connected to the individual Ethernet
ports [as given by the show mac command].

Just to further clarify, the switch is a Cisco 3548.

Mahesh

>>> "Davis, Donald" <donald.davis@firstcitizens.com> 03/14/02 08:55AM >>>
You probably want the MIB-2 variable that returns the ARP cache.

snmpwalk [target] .1.3.6.1.2.1.4.22.1.2

Don Davis

-----Original Message-----
From: Mahesh Tailor [mailto:MTailor@carilion.com]
Sent: Thursday, March 14, 2002 8:43 AM
To: nv-l@lists.tivoli.com
Subject: [nv-l] Slightly off the subject


Does anyone what the MIB variable is to obtain the information provided by
the show mac command on a Cisco 3500 switch?

Thanks.

Mahesh


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