06-13-2019 05:50 AM
Dear Sir,
I would like to request to explain about BGP up/downtime and collision late error.please?
when i check using show ip bgp summary,we can see as below .In the Up/Down is show BGP uptime?
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.100.1.1 4 200 26 22 199 0 0 00:14:23 23 10.200.1.1 4 300 21 51 199 0 0 00:13:40 0
I always saw this time is 5week3days 6weeks1days..etc.But i didn't see 1 years or 2 years.Let me know BGP reset their UP time ? Let me know what time will reset this up time ?
When i check in my router i saw LATE collision error message in our WAN link.Let me know it can be effect to our internet speed ?
Solved! Go to Solution.
06-14-2019 07:29 AM - edited 06-14-2019 07:33 AM
Hello MrBeginner,
you have not cleared the counters.
We look at the output section
389785200 packets output
6176889 output errors,
the error ratio is calculated as : errored packets / (output packets + errored packets)=
= 6176889 / (6176889+389785200) = 0,01559969798017708710492230987295 = 1,559 %
However, to be noted there is an high number of interface resets :
>> 1463886 interface resets
This are not good also the late collisions if increasing should mean the other side is working in full duplex.
So check the LAN cable, change it with one that you know works well and try to use static settings
of
speed 100
duplex full
clear the counters on the interface with:
clear counters giga9
Note:
the use of speed 100 duplex full may solve or it can make the performance worse. Check with the ISP if their router supports 100 Mbps full duplex. If ISP router is able the issue should be on the LAN cable.
So changing the LAN cable is the first wise action to do.
Hope to help
Giuseppe
06-13-2019 06:04 AM
06-13-2019 11:30 AM
Hi,
Thanks for your help. Can I request to explain about BGP up time?
I want to if the neighbor router is no issue, bgp is always up?May be one year,2year ,3year? When they reestablished?
The late collision message is got other issue.It is ISP issue.because my site is auto config. I changed half duplex .still got error.ISP work half dulplex.I would like to know this Late collision error will case to slow internet speed or we can get more delay?
06-13-2019 12:50 PM
06-13-2019 06:40 PM - edited 06-14-2019 02:25 AM
Hi,
please see the below output as you advice.This one will effect to network performance ?
GigabitEthernet9 is up, line protocol is up
Hardware is PQ3_TSEC, address is 00b7.716a.42db (bia 00b7.716a.42db)
Description: WAN NETWORK-ISP LINK
Internet address is 2.1.1.2/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half Duplex, 100Mbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1024
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 43000 bits/sec, 18 packets/sec
5 minute output rate 22000 bits/sec, 21 packets/sec
331312845 packets input, 112471702274 bytes, 0 no buffer
Received 14587 broadcasts (0 IP 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
389785200 packets output, 102216124230 bytes, 10 underruns
6176889 output errors, 3229058 collisions, 1463886 interface resets
0 unknown protocol drops
0 babbles, 1820487 late collision, 4353333 deferred
6 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
06-19-2019 12:13 AM
Hi,
you told that Yes in theory it could stay up that long no problem but in the real world at some stage the ISP will introduce new hardware or do a software upgrade which would take down the circuit and that would cause the timers to reset ,whenever the BGP neighbour goes down ,the interface goes down or the circuit itself fails these would cause outages to the BGP relationship and reset the timers
That mean if bgp relationship outages ,it will effect connectivity ? how much outages should be acceptable ? Because my network bgp up time is aways change 1w ,3 w only. I never see 7 week or 8 wees.
06-19-2019 12:51 AM
06-19-2019 07:30 AM
Hi ,
Thank for explains.you are correct some of my application got error.But I don't know how to ask ISP because I have less experience. I can verify my interface is always up.I can monitor the ISP physical link but i don't know how monitor the bgp peer issue.So let me know can I request to check their circuit and request log?
06-19-2019 07:50 AM
06-13-2019 12:58 PM
Hello MrBeginner,
late collisions are collisions that are detected after the first 64 bytes of the ethernet frame.
Usually, late collisions are caused by duplex mismatch : one side is full duplex and the other side is half duplex. Late collisions should increment on the half duplex side of the link.
It is strange that you see these errors after having changed the duplex settings on your side.
About BGP there is not an upper limit to a BGP session uptime.
As asked by Georg you should post the show interface <WAN> in order to understand the ratio of errors compared to valid packets. An error ratio less then 1% can be acceptable on half duplex link.
If the error ratio is greater then 2% there is some issue that needs to be solved starting to check the cable.
Hope to help
Giuseppe
06-13-2019 09:15 PM
Hi ,
How to calculate % .I am beginner in network.
06-13-2019 11:55 PM
Hello,
post the show interface <WAN>
and we will show you how to perform this calculation.
Hope to help
Giuseppe
06-14-2019 02:28 AM
Hi,
please see the below output as you advice.This one will effect to network performance ?
GigabitEthernet9 is up, line protocol is up
Hardware is PQ_TSEC, address is 00b7.716a.42db (bia 00b7.716a.42db)
Description: WAN NETWORK-ISP LINK
Internet address is 2.1.1.2/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half Duplex, 100Mbps, media type is RJ45
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1024
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 43000 bits/sec, 18 packets/sec
5 minute output rate 22000 bits/sec, 21 packets/sec
331312845 packets input, 112471702274 bytes, 0 no buffer
Received 14587 broadcasts (0 IP 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
389785200 packets output, 102216124230 bytes, 10 underruns
6176889 output errors, 3229058 collisions, 1463886 interface resets
0 unknown protocol drops
0 babbles, 1820487 late collision, 4353333 deferred
6 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
06-14-2019 07:29 AM - edited 06-14-2019 07:33 AM
Hello MrBeginner,
you have not cleared the counters.
We look at the output section
389785200 packets output
6176889 output errors,
the error ratio is calculated as : errored packets / (output packets + errored packets)=
= 6176889 / (6176889+389785200) = 0,01559969798017708710492230987295 = 1,559 %
However, to be noted there is an high number of interface resets :
>> 1463886 interface resets
This are not good also the late collisions if increasing should mean the other side is working in full duplex.
So check the LAN cable, change it with one that you know works well and try to use static settings
of
speed 100
duplex full
clear the counters on the interface with:
clear counters giga9
Note:
the use of speed 100 duplex full may solve or it can make the performance worse. Check with the ISP if their router supports 100 Mbps full duplex. If ISP router is able the issue should be on the LAN cable.
So changing the LAN cable is the first wise action to do.
Hope to help
Giuseppe
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