07-06-2012
12:39 PM
- last edited on
03-04-2019
04:54 PM
by
NikolaIvanov
Hi everybody,
I have a issue in my network, i have 2 data connections with 2 different ISP (Principal & Backup connection).
But with ISP "X" the RTO are stable (RTO 240), but with the ISP "Y" the RTO is in 5000 and the connection always are flapping
What can i say to my "Y" ISP?
Thanks!!
07-06-2012 01:23 PM
Hi
what about the other neighbors' values? Try posting the output of
show ip eigrp neighbors
Those timeouts might be due to a number of reasons...
07-06-2012 01:34 PM
Hi Francesco,
This is it:
XXXX#sh ip eigrp neighbors
IP-EIGRP neighbors for process 18
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 30.30.30.2 Fa0/0 14 03:47:51 137 5000 0 122758
Thanks!
07-06-2012 01:46 PM
You might have occasionally (actually not in you output) high SRTT values, which
lead to timeouts and consequently highs RTO values.
You should gather some stats about rtt, jitter and packet loss values: for instance
you could try running an extended ping to 30.30.30.2 with your router-id as the source
of icmp packets
07-06-2012 01:31 PM
pleasepost more info:
show ip eigrp interface
show ip eigrp nei
show interface point_to_Y
and post the RTT as well, the full output. 5000 is not a casual value.
http://www.cisco.com/en/US/docs/ios/12_0/np1/command/reference/1reigrp.html
HTH
Alessio
07-06-2012 01:45 PM
07-06-2012 01:50 PM
Sure... there's a lot of reason why that would do so, high rtts, jitter over wan, maybe even
a unidirectional wan link...
07-06-2012 02:16 PM
You did not get what i meant.
No matters
Alessio
07-06-2012 02:20 PM
Hi!!
this is the information that you ask:
XXXXX>sh ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.1 Fa0 13 05:59:16 1191 5000 0 4
XXXXXX>sh ip eigrp interfaces fa0
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0 1 0/0 1191 0/10 5956 0
XXXXX>sh int fa0
FastEthernet0 is up, line protocol is up
Hardware is PQUICC_FEC, address is 0019.e8c9.d469 (bia 0019.e8c9.d469)
Internet address is 192.168.1.2/24
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, 100BaseTX/FX
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: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
150811 packets input, 201215750 bytes
Received 5207 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
153684 packets output, 201503066 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 output buffer failures, 0 output buffers swapped out
This is the another point:
XXXXX#show ip eigrp interface fa0
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0 1 0/0 4 0/10 50 0
XXXXXX#show ip eigrp nei
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 192.168.1.2 Fa0 13 06:03:55 4 200 0 12
XXXXXXX#show interface fa0
FastEthernet0 is up, line protocol is up
Hardware is PQUICC_FEC, address is 0013.c42c.732f (bia 0013.c42c.732f)
Internet address is 192.168.1.1/24
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, 100BaseTX/FX
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: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 1 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
5408 packets input, 494337 bytes
Received 5092 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
7624 packets output, 640891 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 output buffer failures, 0 output buffers swapped out
Thanks!!
07-06-2012 01:59 PM
Hi Kenneth,
neighbors flapping is due to, missed hello-packet from remote-eigrp peer.
what is the bandwidth set on the interface, on one which neighbors is flapping?
Look forward to hear from you.
thanks
07-06-2012 02:39 PM
Hi
rizwanr74
The interface bandwidth set 100mbps and it is 192.168.1.2 that is constantly flapping....
thanks
07-06-2012 03:06 PM
Hello,
what is actually flapping - interface or EIGRP? can we have a 'sh logg' please?
EIGRP uses multicast for hello transmission, right? hence verifying unicast might not be the way forward. Do you have any issues with multicast? can you ping 224.0.0.10 off that interface?
07-06-2012 03:11 PM
the interface speed should be 100 Mbps ... no 10..
check again
Alessio
07-06-2012 03:38 PM
Smooth Round Trip Time (SRTT) - the average time in milliseconds between the transmission of a packet to a neighbour and the receipt of an acknowledgement.
Retransmission Timeout (RTO) - if a multicast has failed, then a unicast is sent to that particular router, the RTO is the time in milliseconds that the router waits for an acknowledgement of that unicast.
I talk to with "Y" ISP and they said that problem is that between these two points in the ring of them, is a very long distance, they will change the route of the fiber.
Thank you very much for your help.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide