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11-26-2009
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04-29-2010
10:32 AM
Hi Paul, This is very odd, Could you share how it is connected the configurations you have applied on the .1 & .3 interfaces of the switches. Also understanding from the description i see 192.168.1.1 , 1.2 & 1.3 are all IP addresses of different switches connected directly is that right?
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04-29-2010
09:55 AM
Hi The best way to determine the same are through the following error messages on your switch logs i) %STANDBY-3-DUPADDR: Duplicate address ii) %MAC_MOVE-SP-4-NOTIF: Host ---> Between Hosts iii) High CPU on the devices All the above state that there is a loop in your network and STP was not able to take action on the same.
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11-28-2009
01:12 PM
Edurado, Could you try reconfiguring the DHCP snoopig configurations once again, this is a pretty know symptom that unless no binding tables are created for dhcp snooping it would never work even with a release renew. Also i agree with you that with snooping table not complete we cannot implement DAI. Hence please do try the above and let me know how it goes. Also if you could provide a brief idea of your topology right from your DHCP server to the end client we can identify where exaclty we are missing the link.
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11-28-2009
01:06 PM
Adding to the above more in specifics, "3750 switches have a feature called automatic medium-dependent interfacecrossover (Auto-MDIX) which is enabled by default. With MDIX enabled - the interface automatically detects the required cable connection type (straight through or crossover) and configures the connection appropriately. Without MDIX - you should only use the right kind of cable i.e. cross-over or straight thru but with Auto-MDIX enabled, you can use either type of cable to connect to other devices, and the interface automatically corrects for any incorrect cabling." Could you try a cross-over cable between the switches & see if that works when you hardcode the settings to 100/full on both ends?
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11-26-2009
05:13 PM
When configuring the Quality of Service (QoS) policies, adequate bandwidth must exist for all required applications. The sum of all bandwidth used on each major application represents the minimum bandwidth requirement for any given link. This should consume no more than 75 percent of the total bandwidth available on that link. When there is available bandwidth that the total amount intended (or configured) to be used, the router will not apply the service policy. For manifestations of the problem, refer to the bolded lines in this example: ! policy-map TSA-ATM class TSA-LEVEL-1 bandwidth percent 50 queue-limit 100 class TSA-ATM-LEVEL-2 bandwidth percent 25 class TSA-ATM-LEVEL-3 bandwidth percent 15 class class-default fair-queue queue-limit 100 ! interface ATM1/IMA1.40 point-to-point description TSA case collection connection (Local VPI/VCI 1/40, Remote VPI/VCI 1/50) ip address 10.1.1.1 255.255.255.252 pvc TSA-ATM 1/40 vbr-nrt 3000 1536 1 no ilmi manage oam-pvc manage encapsulation aal5snap service-policy output TSA-ATM <----This is the line that will not be add by IOS ! cdp enable ! With the bandwidth percent configured, Cisco IOS® Software determines the percent based off the Sustainable Cell Rate (SCR) value in the vbr-nrt statement. In this case, the value is 1536k. This is how bandwidth works: 1536 times 50 percent = 768k 1536 times 25 percent = 384k 1536 times 15 percent = 230k 768 plus 384 plus 230 = 1382 To add these percentages: 1536 times (50 plus 25 plus 15) percent = 1536 times 90 percent = 1382. The router determines the available bandwidth to be used as being 75 percent of the SCR. In this case, the amount of bandwidth available would be 1536 times 768 = 1152. This is less than the bandwidth configured for use (1382). Therefore, the router will not apply the service policy. For a workaround to this problem, issue the max-reserved-bandwidth command. Refer to these examples: Router#conf t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#int atm1/ima1.40 Router(config-subif)#pvc TSA-ATM 1/40 Router(config-if-atm-vc)#max-reserved-bandwidth 90 Router(config-if-atm-vc)#end Router#sho que Router#sho queue atm1/ima1.40 Interface ATM1/IMA1.40 VC 1/40 Queueing strategy: weighted fair Output queue: 0/512/100/0 (size/max total/threshold/drops) Conversations 0/1/64 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 1382 kilobits/sec Router# Router#sh run int atm1/ima1.40 Building configuration... Current configuration : 266 bytes ! interface ATM1/IMA1.40 point-to-point description TSA Case Collection Connection (Local VPI/VCI 1/40, Remote VPI/VCI 1/50) ip address 10.1.1.1 255.255.255.252 pvc TSA-ATM 1/40 vbr-nrt 3000 1536 1 max-reserved-bandwidth 90 service-policy output TSA-ATM ! end Router#show policy-map int Router#show policy-map interface atm1/ima1.40 ATM1/IMA1.40: VC 1/40 - Service-policy output: TSA-ATM Class-map: TSA-ATM-LEVEL-1 (match-all) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: access-group 110 Queueing Output Queue: Conversation 73 Bandwidth 50 (%) Bandwidth 768 (kbps) Max Threshold 64 (packets) (pkts matched/bytes matched) 0/0 (depth/total drops/no-buffer drops) 0/0/0 Class-map: TSA-ATM-LEVEL-2 (match-all) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: access-group 111 Queueing Output Queue: Conversation 74 Bandwidth 25 (%) Bandwidth 384 (kbps) Max Threshold 64 (packets) (pkts matched/bytes matched) 0/0 (depth/total drops/no-buffer drops) 0/0/0 Class-map: TSA-ATM-LEVEL-3 (match-all) 0 packets, 0 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: access-group 112 Queueing Output Queue: Conversation 75 Bandwidth 15 (%) Bandwidth 230 (kbps) Max Threshold 64 (packets) (pkts matched/bytes matched) 0/0 (depth/total drops/no-buffer drops) 0/0/0 Class-map: class-default (match-any) 1 packets, 32 bytes 5 minute offered rate 0 bps, drop rate 0 bps Match: any Queueing Flow Based Fair Queueing Maximum Number of Hashed Queues 64 (total queued/total drops/no-buffer drops) 0/0/0 Router# For more informaton on the max-reserved-bandwidth command, refer to Understanding the max-reserved-bandwidth Command on ATM PVCs.
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04-29-2010
HiThe best way to determine the same are through the following error
messages on your switch logsi) ...
11-28-2009
Edurado,Could you try reconfiguring the DHCP snoopig configurations once
again, this is a pretty kno...
11-26-2009
/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table
Normal"; mso-tstyle-rowband-size...
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| Date Registered | 11-26-2009 04:53 PM |
| Date Last Visited | 08-18-2017 03:53 AM |
| Total Messages Posted | 4 |
