Hi, since 4 weeks we have much trouble in our mixed switched network. We have Cisco 2950, 2960 and Enterasys VH124-24 switches. All was normal, but then the Cisco 2950 switches have massive performance problems (round trip time > 600ms) between the other 2950 switches. The Enterasys have this problems only from time to time. The 2960 switches are only affected when the 2950 did not respond anymore.
Any Idea where we can look for?
Regards, Boert
Is the hardware issue?
boert wrote:
Do you have throttles in vlan 1 ?
Yes, there are lots of throttles on vlan 1 of the 2950 switches. The other switches have no throttles on vlan 1.
Regards Boert
I have the same problem . i.e. loads of throttles in VLAN1. But I still need to figure out what causes this, and if it has any affect/impact of the switchs performance.
Do you have any other model that you could try to replace it with ?
First of all define LOTS, please. Ideas vary.
Best expressed as a ratio and rate I guess.
Clear the counters, wait 24 hours:- post sh int vlan1 sh int (busiest interface or few)
Throttles in VLAN 1 will be the result of excessive traffic getting to the vlan 1 interface, i.e. the management interface.
This traffic could be broadcast traffic, or multicast traffic or unicast traffic directed at the mac of VLAN 1.
On a 2950 the CPU is pretty puny and it will not be very hard to overwhelm it.
Check the CPU utilisation. The risk is that the switch will not be able to do housekeeping and will for example fail to process BPDUs which could result in a spanning tree loop. Also the switch may not be able to manage it's MAC table. This will affect learning and forgetting. Otherwise, basic forwarding is done in hardware and will be unaffected.
I recently dealt with a case where every IP phone port had all vlans configured. This resulted in about a thousand STP virtual ports that had to be managed. i.e. BPDU sent every
2 seconds etc. the CPU fell quite a bit when that was fixed:-)Also - plug in a sniffer (ethereal or whatever) and see what the broadcast traffic looks like.
All you want is a bit of a graph to get an idea if there is anything odd going on.
Do NOT use VLAN 1 for data traffic!!!! I won't say NEVER because if you only have a single switch with a just one VLAN, and just a few megabits/sec of traffic THROUGH the switch then you should be ok. If you have more than one VLAN defined on the switch, NEVER use VLAN 1 for anything. VLAN 1 is used for the control plane, and when you start mixing control and data plane traffic, weird things can happen.
Here is a link to the Cisco LAN Switching Best Practices Guide:
Scott
Indeed, that is the best plan.
I am completely aware of the use and recommendation og use for native vlan. I am not using vlan1 for anything but management. I use around 50 VLAN in VTP domain, so it is in the clear of the limits of
64 on 2950'sI just get the throttles in vlan1 on C2950 IOS switches, ONLY on C2950 switches ! i.e. NOT on other models, like 2940's, 2900Xl, 3500XL, 3550's, 2960's 3560's
4500's and 6500's - Just on C2950. Since the original topic/thread was around c2950's, I posted my observations around this model. And again, I am not sure this behavoir has any effect on the switch and/or performance of the switch. I have only observed it, and still need to verify what the root cause is.So if you guys, have any input, as to what causes throttels in vlan1 on c2950's, please speak up, but please keep the thread on focus. I am running latest IOS.
regards, Martin Bilgrav
Throttles are the result of excessive taffic arriving at an interface such that there is insufficient CPU or possibly other resource to deal with it. My understanding is that Interrupts are turned off 'throttled' for a period to give the chance for the CPU do do essential housekeeping.
It will probably take a LOT of digging to get to the bottom of it.
The root cause may not be traffic on VLAN 1 but that the CPU is busy with other things. For example how many STP instances are you running?
How many STP ports are there? sh span summ ! < -- the bottom line has the info.
Are you doing a lot of logging, snmp?
I would start by plotting CPU and throttles via say snmp. If there was a correlation I would then worry about what was causing the CPU.
Here comes sh int vlan 1 and sh int fastethernet 0/25 (the uplink interface):
swXX#sh int vlan 1 Vlan1 is up, line protocol is up Hardware is CPU Interface, address is 000b.fd76.9900 (bia
000b.fd76.9900) Internet address is xxx.xxx.xxx.xxx/24 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output never, output hang never Last clearing of "show interface" counters 19:45:37 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 32000 bits/sec, 47 packets/sec 5 minute output rate 33000 bits/sec, 48 packets/sec 4570366 packets input, 373567217 bytes, 0 no buffer Received 1624174 broadcasts (0 IP multicast) 0 runts, 0 giants, 54974 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 3485 ignored 3400123 packets output, 290914884 bytes, 0 underruns 0 output errors, 0 interface resets 0 output buffer failures, 0 output buffers swapped out swXX#sh int faste 0/25 FastEthernet0/25 is up, line protocol is up (connected) Hardware is Fast Ethernet, address is 000b.fd76.9919 (bia 000b.fd76.9919) Description: Uplink EIII MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 100BaseFX input flow-control is unsupported output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:01, output 00:00:02, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 35000 bits/sec, 49 packets/sec 5 minute output rate 29000 bits/sec, 41 packets/sec 206884483 packets input, 1775484953 bytes, 36084 no buffer Received 109154222 broadcasts (0 multicast) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 36084 ignored 0 watchdog, 5606682 multicast, 0 pause input 0 input packets with dribble condition detected 92983878 packets output, 1445024690 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped outand sh spanning-tree:
swXX#sh spanning-tree
VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32768 Address 0000.1d36.26ce Cost 200068 Port 25 (FastEthernet0/25) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000b.fd76.9900 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
-------------------------------- Fa0/4 Desg FWD 19 128.4 P2p Fa0/5 Desg FWD 19 128.5 P2p Fa0/7 Desg FWD 19 128.7 P2p Fa0/9 Desg FWD 19 128.9 P2p Fa0/10 Desg FWD 19 128.10 P2p Fa0/12 Desg FWD 100 128.12 P2p Fa0/13 Desg FWD 19 128.13 P2p
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/15 Desg FWD 19 128.15 P2p Fa0/19 Desg FWD 100 128.19 P2p Fa0/23 Desg FWD 19 128.23 P2p Fa0/25 Root FWD 19 128.25 P2p
sh proc cpu:
swXX#sh proc cpu CPU utilization for five seconds: 22%/4%; one minute: 23%; five minutes: 22% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 1 4 3 1333 0.00% 0.00% 0.00% 0 Chunk Manager 2 5232 483466 10 0.00% 0.00% 0.00% 0 Load Meter 3 2640 1575 1676 0.00% 0.00% 0.00% 0 SpanTree Helper 4 532580 45076282 11 0.00% 0.01% 0.00% 0 Next Page 5 687728 246040 2795 0.00% 0.03% 0.00% 0 Check heaps 6 7100344 1875087 3786 0.73% 0.53% 0.52% 0 Pool Manager 7 0 2 0 0.00% 0.00% 0.00% 0 Timers 8 104 2 52000 0.00% 0.00% 0.00% 0 Entity MIB API 9 18784 483381 38 0.00% 0.00% 0.00% 0 HC Counter Timer 10 30925928 25807827 1198 0.08% 0.05% 0.08% 0 ARP Input 11 4 26 153 0.00% 0.00% 0.00% 0 Net Input 12 0 1 0 0.00% 0.00% 0.00% 0 Critical Bkgnd 13 1280956 583209 2196 0.00% 0.00% 0.00% 0 Net Background 14 140 2456 57 0.00% 0.00% 0.00% 0 Logger 15 32700 2414383 13 0.00% 0.00% 0.00% 0 TTY Background 16 265824 2414392 110 0.00% 0.00% 0.00% 0 Per-Second Jobs 17 129696 483472 268 0.00% 0.00% 0.00% 0 Compute load avg 18 495708 40282 12305 0.00% 0.01% 0.00% 0 Per-minute Jobs 19 0 3 0 0.00% 0.00% 0.00% 0 AggMgr Process 20 0 2 0 0.00% 0.00% 0.00% 0 Calhoun Storm Co 21 10266460 57944645 177 0.49% 0.55% 0.55% 0 Calhoun LED Proc PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 22 20672848 4784423 4320 0.81% 0.83% 0.82% 0 Calhoun Statisti 23 601060 11825776 50 0.00% 0.01% 0.00% 0 HMATM Learn proc 24 6796 2478 2742 0.00% 0.00% 0.00% 0 CalhounPM 25 12365624 11944770 1035 0.16% 0.15% 0.15% 0 Link Status Proc 26 0 1 0 0.00% 0.00% 0.00% 0 CalhounInsIpopti 27 0 1 0 0.00% 0.00% 0.00% 0 Calhoun DHCP Sno 28 769540 325091 2367 0.00% 0.02% 0.00% 0 CDP Protocol 29 240 20146 11 0.00% 0.00% 0.00% 0 DHCP Snooping 30 22942032 10999722 2085 0.57% 0.95% 0.89% 0 IP Input 31 760620 625902 1215 0.00% 0.01% 0.00% 0 DTP Protocol 32 6052 241692 25 0.00% 0.00% 0.00% 0 Ethchnl 33 12 5 2400 0.00% 0.00% 0.00% 0 VLAN Manager 34 0 2 0 0.00% 0.00% 0.00% 0 PI MATM Aging Pr 35 5608 11333 494 0.00% 0.00% 0.00% 0 VMATM Callback 36 12169356 4018438 3028 0.16% 0.16% 0.16% 0 Spanning Tree 37 76496 2417453 31 0.00% 0.00% 0.00% 0 UDLD 38 560 40291 13 0.00% 0.00% 0.00% 0 Port-Security 39 93132 87030 1070 0.00% 0.00% 0.00% 0 DHCPD Receive 40 0 1 0 0.00% 0.00% 0.00% 0 HTTP Timer 41 4 13 307 0.00% 0.00% 0.00% 0 RARP Input 42 264 2367 111 0.00% 0.01% 0.00% 0 TCP Timer 43 1436 1031 1392 0.00% 0.00% 0.00% 0 TCP Protocols PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 44 0 1 0 0.00% 0.00% 0.00% 0 Socket Timers 45 5272 8533 617 0.00% 0.00% 0.00% 0 L2MM 46 50348 96450 522 0.00% 0.00% 0.00% 0 MRD 47 542136 246780 2196 0.00% 0.00% 0.00% 0 IGMPSN 48 103592 17502 5918 0.00% 0.00% 0.00% 0 IGMP Snooping Pr 49 120952 230838 523 0.00% 0.00% 0.00% 0 IGMP Snooping Re 50 18620 64110 290 0.00% 0.00% 0.00% 0 IP Multicast Dat 51 4 2 2000 0.00% 0.00% 0.00% 0 L2TRACE SERVER 52 240 30220 7 0.00% 0.00% 0.00% 0 Cluster L2 53 11148 241691 46 0.00% 0.00% 0.00% 0 Cluster RARP 54 54228 372880 145 0.00% 0.00% 0.00% 0 Cluster Base 55 2604 8352 311 0.00% 0.00% 0.00% 0 SSH Event handle 56 592 20146 29 0.00% 0.00% 0.00% 0 DHCPD Timer 57 0 2 0 0.00% 0.00% 0.00% 0 Router Autoconf 58 591148 2860 206695 0.00% 0.00% 0.00% 0 Key Proc 59 4 3 1333 0.00% 0.00% 0.00% 0 Crypto CA 60 0 1 0 0.00% 0.00% 0.00% 0 Syslog Traps 61 0 2 0 0.00% 0.00% 0.00% 0 VTPMIB EDIT BUFF 62 220596 7712866 28 0.00% 0.00% 0.00% 0 PM Callback 63 0 9 0 0.00% 0.00% 0.00% 0 VTP Trap Process 64 28104 684779 41 0.00% 0.00% 0.00% 0 DHCPD Database 65 23496 2414389 9 0.00% 0.00% 0.00% 0 Calhoun EnvMon P PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 66 0 2 0 0.00% 0.00% 0.00% 0 STP STACK TOPOLO 67 0 2 0 0.00% 0.00% 0.00% 0 STP FAST TRANSIT 68 0 2 0 0.00% 0.00% 0.00% 0 STP STACK TOPOLO 69 0 2 0 0.00% 0.00% 0.00% 0 CSRT RAPID TRANS 71 0 3 0 0.00% 0.00% 0.00% 0 SNMP Timers 72 73552168 6670551 11026 3.68% 3.77% 3.79% 0 IP SNMP 73 23370392 3357356 6960 1.88% 1.80% 1.80% 0 PDU DISPATCHER 74 133161840 3371089 39501 10.56% 10.56% 10.46% 0 SNMP ENGINE 75 0 1 0 0.00% 0.00% 0.00% 0 SNMP ConfCopyPro 76 5276 966 5461 0.00% 0.00% 0.00% 0 SNMP Traps 77 84048 2468643 34 0.00% 0.00% 0.00% 0 NTP 78 576 173 3329 0.00% 0.22% 0.10% 1 Virtual Exec
The problems only! occour on catalyst 2950 switches!
Regards Boert
snipped-for-privacy@hotmail.co.uk schrieb:
There are 13 STP Ports. SNMP Traps are enabled. There are not lots of logging.
Regards Boert
snipped-for-privacy@hotmail.co.uk schrieb:
Here comes sh int vlan 1 and sh int fastethernet 0/25 (the uplink interface):
swXX#sh int vlan 1 Vlan1 is up, line protocol is up Hardware is CPU Interface, address is 000b.fd76.9900 (bia
000b.fd76.9900) Internet address is xxx.xxx.xxx.xxx/24 MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output never, output hang never Last clearing of "show interface" counters 19:45:37 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 32000 bits/sec, 47 packets/sec 5 minute output rate 33000 bits/sec, 48 packets/sec 4570366 packets input, 373567217 bytes, 0 no buffer Received 1624174 broadcasts (0 IP multicast) 0 runts, 0 giants, 54974 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 3485 ignored 3400123 packets output, 290914884 bytes, 0 underruns 0 output errors, 0 interface resets 0 output buffer failures, 0 output buffers swapped out swXX#sh int faste 0/25 FastEthernet0/25 is up, line protocol is up (connected) Hardware is Fast Ethernet, address is 000b.fd76.9919 (bia 000b.fd76.9919) Description: Uplink EIII MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) Full-duplex, 100Mb/s, media type is 100BaseFX input flow-control is unsupported output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:01, output 00:00:02, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 35000 bits/sec, 49 packets/sec 5 minute output rate 29000 bits/sec, 41 packets/sec 206884483 packets input, 1775484953 bytes, 36084 no buffer Received 109154222 broadcasts (0 multicast) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 36084 ignored 0 watchdog, 5606682 multicast, 0 pause input 0 input packets with dribble condition detected 92983878 packets output, 1445024690 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier, 0 PAUSE output 0 output buffer failures, 0 output buffers swapped outand sh spanning-tree:
swXX#sh spanning-tree
VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32768 Address 0000.1d36.26ce Cost 200068 Port 25 (FastEthernet0/25) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 000b.fd76.9900 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
-------------------------------- Fa0/4 Desg FWD 19 128.4 P2p Fa0/5 Desg FWD 19 128.5 P2p Fa0/7 Desg FWD 19 128.7 P2p Fa0/9 Desg FWD 19 128.9 P2p Fa0/10 Desg FWD 19 128.10 P2p Fa0/12 Desg FWD 100 128.12 P2p Fa0/13 Desg FWD 19 128.13 P2p
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/15 Desg FWD 19 128.15 P2p Fa0/19 Desg FWD 100 128.19 P2p Fa0/23 Desg FWD 19 128.23 P2p Fa0/25 Root FWD 19 128.25 P2p
sh proc cpu:
swXX#sh proc cpu CPU utilization for five seconds: 22%/4%; one minute: 23%; five minutes: 22% PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 1 4 3 1333 0.00% 0.00% 0.00% 0 Chunk Manager 2 5232 483466 10 0.00% 0.00% 0.00% 0 Load Meter 3 2640 1575 1676 0.00% 0.00% 0.00% 0 SpanTree Helper 4 532580 45076282 11 0.00% 0.01% 0.00% 0 Next Page 5 687728 246040 2795 0.00% 0.03% 0.00% 0 Check heaps 6 7100344 1875087 3786 0.73% 0.53% 0.52% 0 Pool Manager 7 0 2 0 0.00% 0.00% 0.00% 0 Timers 8 104 2 52000 0.00% 0.00% 0.00% 0 Entity MIB API 9 18784 483381 38 0.00% 0.00% 0.00% 0 HC Counter Timer 10 30925928 25807827 1198 0.08% 0.05% 0.08% 0 ARP Input 11 4 26 153 0.00% 0.00% 0.00% 0 Net Input 12 0 1 0 0.00% 0.00% 0.00% 0 Critical Bkgnd 13 1280956 583209 2196 0.00% 0.00% 0.00% 0 Net Background 14 140 2456 57 0.00% 0.00% 0.00% 0 Logger 15 32700 2414383 13 0.00% 0.00% 0.00% 0 TTY Background 16 265824 2414392 110 0.00% 0.00% 0.00% 0 Per-Second Jobs 17 129696 483472 268 0.00% 0.00% 0.00% 0 Compute load avg 18 495708 40282 12305 0.00% 0.01% 0.00% 0 Per-minute Jobs 19 0 3 0 0.00% 0.00% 0.00% 0 AggMgr Process 20 0 2 0 0.00% 0.00% 0.00% 0 Calhoun Storm Co 21 10266460 57944645 177 0.49% 0.55% 0.55% 0 Calhoun LED Proc PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 22 20672848 4784423 4320 0.81% 0.83% 0.82% 0 Calhoun Statisti 23 601060 11825776 50 0.00% 0.01% 0.00% 0 HMATM Learn proc 24 6796 2478 2742 0.00% 0.00% 0.00% 0 CalhounPM 25 12365624 11944770 1035 0.16% 0.15% 0.15% 0 Link Status Proc 26 0 1 0 0.00% 0.00% 0.00% 0 CalhounInsIpopti 27 0 1 0 0.00% 0.00% 0.00% 0 Calhoun DHCP Sno 28 769540 325091 2367 0.00% 0.02% 0.00% 0 CDP Protocol 29 240 20146 11 0.00% 0.00% 0.00% 0 DHCP Snooping 30 22942032 10999722 2085 0.57% 0.95% 0.89% 0 IP Input 31 760620 625902 1215 0.00% 0.01% 0.00% 0 DTP Protocol 32 6052 241692 25 0.00% 0.00% 0.00% 0 Ethchnl 33 12 5 2400 0.00% 0.00% 0.00% 0 VLAN Manager 34 0 2 0 0.00% 0.00% 0.00% 0 PI MATM Aging Pr 35 5608 11333 494 0.00% 0.00% 0.00% 0 VMATM Callback 36 12169356 4018438 3028 0.16% 0.16% 0.16% 0 Spanning Tree 37 76496 2417453 31 0.00% 0.00% 0.00% 0 UDLD 38 560 40291 13 0.00% 0.00% 0.00% 0 Port-Security 39 93132 87030 1070 0.00% 0.00% 0.00% 0 DHCPD Receive 40 0 1 0 0.00% 0.00% 0.00% 0 HTTP Timer 41 4 13 307 0.00% 0.00% 0.00% 0 RARP Input 42 264 2367 111 0.00% 0.01% 0.00% 0 TCP Timer 43 1436 1031 1392 0.00% 0.00% 0.00% 0 TCP Protocols PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 44 0 1 0 0.00% 0.00% 0.00% 0 Socket Timers 45 5272 8533 617 0.00% 0.00% 0.00% 0 L2MM 46 50348 96450 522 0.00% 0.00% 0.00% 0 MRD 47 542136 246780 2196 0.00% 0.00% 0.00% 0 IGMPSN 48 103592 17502 5918 0.00% 0.00% 0.00% 0 IGMP Snooping Pr 49 120952 230838 523 0.00% 0.00% 0.00% 0 IGMP Snooping Re 50 18620 64110 290 0.00% 0.00% 0.00% 0 IP Multicast Dat 51 4 2 2000 0.00% 0.00% 0.00% 0 L2TRACE SERVER 52 240 30220 7 0.00% 0.00% 0.00% 0 Cluster L2 53 11148 241691 46 0.00% 0.00% 0.00% 0 Cluster RARP 54 54228 372880 145 0.00% 0.00% 0.00% 0 Cluster Base 55 2604 8352 311 0.00% 0.00% 0.00% 0 SSH Event handle 56 592 20146 29 0.00% 0.00% 0.00% 0 DHCPD Timer 57 0 2 0 0.00% 0.00% 0.00% 0 Router Autoconf 58 591148 2860 206695 0.00% 0.00% 0.00% 0 Key Proc 59 4 3 1333 0.00% 0.00% 0.00% 0 Crypto CA 60 0 1 0 0.00% 0.00% 0.00% 0 Syslog Traps 61 0 2 0 0.00% 0.00% 0.00% 0 VTPMIB EDIT BUFF 62 220596 7712866 28 0.00% 0.00% 0.00% 0 PM Callback 63 0 9 0 0.00% 0.00% 0.00% 0 VTP Trap Process 64 28104 684779 41 0.00% 0.00% 0.00% 0 DHCPD Database 65 23496 2414389 9 0.00% 0.00% 0.00% 0 Calhoun EnvMon P PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 66 0 2 0 0.00% 0.00% 0.00% 0 STP STACK TOPOLO 67 0 2 0 0.00% 0.00% 0.00% 0 STP FAST TRANSIT 68 0 2 0 0.00% 0.00% 0.00% 0 STP STACK TOPOLO 69 0 2 0 0.00% 0.00% 0.00% 0 CSRT RAPID TRANS 71 0 3 0 0.00% 0.00% 0.00% 0 SNMP Timers 72 73552168 6670551 11026 3.68% 3.77% 3.79% 0 IP SNMP 73 23370392 3357356 6960 1.88% 1.80% 1.80% 0 PDU DISPATCHER 74 133161840 3371089 39501 10.56% 10.56% 10.46% 0 SNMP ENGINE 75 0 1 0 0.00% 0.00% 0.00% 0 SNMP ConfCopyPro 76 5276 966 5461 0.00% 0.00% 0.00% 0 SNMP Traps 77 84048 2468643 34 0.00% 0.00% 0.00% 0 NTP 78 576 173 3329 0.00% 0.22% 0.10% 1 Virtual Exec
The problems only! occour on catalyst 2950 switches!
Regards Boert
snipped-for-privacy@hotmail.co.uk schrieb:
Turn off SNMP on switch to see if that is the root cause.
Looks like this switch might be over-polled
The No buffer is not good. Keep an eye on it as well, and have the switch replaced if possible, to an other model, like 2960. I am sure your problem will go away ...
your CPU looks like mine ... 8)
HTH Martin
Folks,
This is quite confusing, that is OK by me.
There are two people with similar issues with 2950.
"boert" has in fact two seperate issues.
The reason for this is that the Fast Ethernet no-buffers issue is due to the /hardware/ switching engine being overwhelmed.
The VPN interface throttles is entirely due to the fairly puny management CPU being offered too much traffic.
I put the (maybe) in above when I realised that if the CP?U is not able to manage the forwarding database then the backplane may become stressed. I do not fully understand the
2950 architecture.Boert,
Reduce your snmp polling. Whatever it is that is going on is taking up more resource than the 2950 can reasonably provide.
Maybe there are devices doing snmp that you do not know about.
Put in Access-lists.
The one thing that you have not mentined is whether you are observing any actual user problems. It is all very well to worry about this and that, but if the users are not seeing problems then spending money may be difficult to justify.
This sort of problem is very hard to deal with and not so many or the people that are available are able to make progress. It may well be best to update the hardware.
In particular the CPU on more recent Cisco proucts tends to have a lot more capacity.
There was no excessive snmp traffic seen in etherreal, but after disabling snmp on the 2950 switches, the ping response and performance is much better. The throttles still apear. This confuses me.
The users had performance- and connection problems with snmp enabled. After disabling I didn't heard about problems.
Boert
snipped-for-privacy@hotmail.co.uk schrieb:
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