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Catalyst Symbol Error Frames

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Post #1 of 4 (4797 views) Source Permalink [nsp] Gbic symbol errors Hi, we cisco symbol-err are using serveral Cat. 3524XL here, which are connected to cisco show interface status j-vendor routers. On one of the 3524 (equip. with a LX/LH Gbic 5486) I tried cisco input errors all possible duplex and flowcontrol options, however i always get (fast increasing >100/sec) "Symbol error frames". (show controllers ethernet-controller) I found a short description on this https://supportforums.cisco.com/discussion/9882961/symbol-error-frames error: A Symbol error means the interface detects an undefined(invalid) Symbol received. Small amounts of symbol errors can be ignored. Large amounts of symbol errors could could indicate a bad device, cable or bad hardware. However, does anyone have encountered this error before and if how did you fix it? (Is http://www.gossamer-threads.com/lists/cisco/nsp/10266 this really a hardware fault?) Oh yeah, IOS is Version 12.0(5)WC3b. Btw, on the j-vendor interface i dont see any errors at all. Regards, Jonas steve at telecomplete Feb22,2004,5:53PM Post #2 of 4 (4653 views) Permalink Re: [nsp] Gbic symbol errors [In reply to] > we are using serveral Cat. 3524XL here, which are connected to j-vendor "Juniper" > routers. On one of the 3524 (equip. with a LX/LH Gbic 5486) I tried all > possible duplex and flowcontrol options, however i always get (fast increasing > >100/sec) "Symbol error frames". (show controllers ethernet-controller) Just a guess but if you're connecting LX back to back are you attenuating at all? If not the errors are probably because your overloading the Cisco receiver.. try sticking 10 or 20dB on of attenuation Steve > I found a short description on this error: > A Symbol error means the interface detects an undefined(invalid) Symbol > re

Path First - Implementing Basic OSPF - have a peek here Implementing OSPF over NBMA - Area Types http://jacob-network.com/1095/switchport-interface-sh-int-counters-error and Options EIGRP - EIGRP Routing Concepts and Planning - Implementing Basic EIGRP - Implementing Advanced EIGRP Home Blog Basics IP Addressing and https://www.opennet.ru/openforum/vsluhforumID6/18952.html Subnetting Configuring EtherChannel OSPF OSPF Open Shortest Path First Implementing Basic OSPF Implementing OSPF over NBMA Area Types and Options EIGRP EIGRP Routing Symbol Error Concepts and Planning Implementing Basic EIGRP Implementing Advanced EIGRP switchport/interface - troubleshoot sh int counters errorMarch 12, 2013 by George5 CommentsIt is useful to get familiar with the ‘sh int counters' command, to check if the switchport/interface (switchport-interface) generate failure on the physical or data link layer. Symbol Error Frames In some cases clients has latencies or packet loss and therefore bad network performance. In this blog i want to explain to perform the right outputs and contrue for the troubleshooing. This will be done with the counter command. In general you can use the ‘sh interface counters' for the whole device. The output show. You get information of all ports fo the device. I see how many traffic is generated on each port. sh int counters Lab_2960#sh int counters

Port            InOctets    InUcastPkts    InMcastPkts    InBcastPkts Fa0/1         2607782237       20575978             64           8269 Fa0/2         2512563028       25019118             68           8392 Fa0/3         6566347115       46165305             70           8544 Fa0/4          122927612        1854840            166           3946 Fa0/5         3852466744       31035707             70           8680 Fa0/6         3366037701       30759822            126           9872 Fa0/7         2669734749       23264365             64           8867 Fa0/8         6929619323       51960802             68          14237 Fa0/9         5333231843       45767428           1050          27094 Fa0/10        7820789313       59365097             66           8882 Fa0/11        5229745076       32723963  

(Public) [ ] Cisco CCNA Routing & Switching 3.0 - "Catalyst DROP interface" +/– umca (??) on 27--09,10:32 . , Cisco 2960 Catalyst , QOS - , . ?FastEthernet0/3 is up, line protocol is up (connected)Hardware is Fast Ethernet, address is 001e...MTU 1508 bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255Encapsulation ARPA, loopback not setKeepalive set (10 sec)Half-duplex, 10Mb/s, media type is 10/100BaseTXinput flow-control is off, output flow-control is unsupportedARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:01, output hang neverLast clearing of "show interface" counters 1d00hInput queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 79Queueing strategy: fifoOutput queue: 0/0 (size/max)30 second input rate 0 bits/sec, 0 packets/sec30 second output rate 0 bits/sec, 0 packets/sec 213969 packets input, 40581220 bytes, 0 no buffer Received 173 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast, 0 pause input 0 input packets with dribble condition detected 328358 packets output, 215177591 bytes, 0 underruns 0 output errors, 44700 collisions, 0 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 out | | | C Catalyst DROP interface, sh_, 12:43, 27--09, (1) Catalyst DROP interface, umca, 13:13, 27--09, (2) Catalyst DROP interface, umca, 10:55, 29--09, (3) Catalyst DROP interface, , 11:03, 29--09, (4) Catalyst DROP interface, , 11:04, 29--09, (5) Catalyst DROP interface, umca, 12:18, 29--09, (6) Catalyst DROP interface, haha, 15:34, 29--09, (7) Catalyst DROP interface, umca, 19:44, 29--09, (8) Catalyst DROP interface, , 22:27, 29