1. Cisco Serial Interface Commands

Hi there,

Dear All, When I use the show interface command on the Cisco Router ISR-4331, it will display as below information. The word that I mark red, it refresh every 5 seconds. But, I compare with the old router model like a Cisco 29XX or 28X.

Torrent Download PS2 Bios package including rom1 bin rom2 bin erom bin and loads of SCPH bios. Torrent Link. Eztv.itPS2 Bios package including rom1 bin rom2 bin erom bin and loads of SCPH bios Games. Take.fmPS2 Bios package including rom1 bin rom2 bin erom bin and loads of SCPH bios. Torrent ps2 bios packages.

Some relevant show commands are given below for a cisco router whose L2 on Serial interface seems to be going up & down .. As can be seen from the logs that the L2 goes down/up frequently causing an MGCP gateway re-registration messages on the NMS. I have manually shut/no shut this interface and can't see any CRC errors.
Question is
1. Are there any more show commands which can help diagnose the issue of link flapping ?
2. Your recommendations on what is the possible underlying cause in such instances ?
Thanks !

Interface Flapping Issues

Interface Flapping Issues

Ok, so I am having issues with this router interface flapping and the circuit keeps bouncing. Below are the logs from that router for that specific interface.. Let me know what you think;
WINSCOTT#sh logg
Syslog logging: enabled (1 messages dropped, 0 messages rate-limited,
0 flushes, 0 overruns, xml disabled, filtering disabled)
Console logging: disabled
Monitor logging: level debugging, 0 messages logged, xml disabled,
filtering disabled
Buffer logging: level debugging, 9454 messages logged, xml disabled,
filtering disabled
Logging Exception size (4096 bytes)
Count and timestamp logging messages: disabled
No active filter modules.
Trap logging: level informational, 9820 message lines logged
Log Buffer (4096 bytes):
.Sep 23 22:53:00.004: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
.Sep 23 22:53:09.988: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
.Sep 23 22:53:19.973: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
.Sep 23 22:53:29.957: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
.Sep 23 22:53:36.113: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
.Sep 23 22:53:38.109: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to reset
.Sep 23 23:15:53.941: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
.Sep 23 23:15:54.045: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
.Sep 23 23:15:54.561: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to up
.Sep 23 23:16:22.678: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Up
Sep 23 23:28:52.042: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
Sep 23 23:31:31.790: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
Sep 23 23:34:03.601: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
Sep 23 23:34:05.597: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to reset

Cisco Serial Interface Commands

Sep 23 23:34:05.617: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Down Interface flap
Sep 23 23:34:06.597: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to down
Sep 23 23:35:00.510: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
Sep 23 23:35:01.166: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
Sep 23 23:35:02.170: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to up
Sep 23 23:35:31.579: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Up
Sep 23 23:35:37.451: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
Sep 23 23:35:39.451: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to reset
Sep 23 23:35:39.471: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Down Interface flap
Sep 23 23:35:40.451: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to down
Sep 23 23:35:53.423: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
Sep 23 23:35:55.419: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
Sep 23 23:36:43.344: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
Sep 23 23:36:44.652: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
Sep 23 23:36:45.656: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to up
Sep 23 23:37:16.417: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Up
Sep 23 23:46:02.383: %E1T1_MODULE-3-LINEFLAP: Interface Serial0/0:0 receiving excessive errored packets
Sep 23 23:46:05.403: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
Sep 23 23:46:07.399: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to reset
Sep 23 23:46:07.419: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Down Interface flap
Sep 23 23:46:08.399: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to down
Sep 23 23:46:33.355: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
Sep 23 23:46:34.751: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
Sep 23 23:46:35.755: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to up
Sep 23 23:46:48.332: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to down (AIS detected)
Sep 23 23:46:50.332: %LINK-5-CHANGED: Interface Serial0/0:0, changed state to reset
Sep 23 23:46:51.332: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to down
Sep 23 23:47:46.237: %CONTROLLER-5-UPDOWN: Controller T1 0/0, changed state to up
Sep 23 23:47:47.209: %LINK-3-UPDOWN: Interface Serial0/0:0, changed state to up
Sep 23 23:47:48.213: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to up
Sep 23 23:48:09.033: %BGP-5-ADJCHANGE: neighbor 12.84.202.225 Up
WINSCOTT#
controller T1 0/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
interface Serial0/0:0
description
bandwidth 15300
ip address #.#.#.# 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
encapsulation ppp
ip route-cache flow
no cdp enable
max-reserved-bandwidth 100
WINSCOTT#sh interfaces serial 0/0:0
Serial0/0:0 is up, line protocol is up
Hardware is DSX1
Description:
Internet address is #.#.#.#/30
MTU 1500 bytes, BW 15300 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: IPCP, loopback not set
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of 'show interface' counters 8w6d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 710
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/27/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 15300 kilobits/sec
5 minute input rate 2000 bits/sec, 5 packets/sec
5 minute output rate 4000 bits/sec, 9 packets/sec
19911684 packets input, 1333062234 bytes, 0 no buffer
Received 0 broadcasts, 7 runts, 1683 giants, 0 throttles
6093022 input errors, 1491388 CRC, 2930389 frame, 0 overrun, 0 ignored, 167
1245 abort
28344028 packets output, 2101646143 bytes, 0 underruns
0 output errors, 0 collisions, 2145 interface resets
3 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
2803 carrier transitions
Timeslot(s) Used:1-24, SCC: 0, Transmitter delay is 0 flags
WINSCOTT#

------------------------------------
Dallas, Texas
Telecommunications Tech
CCVP, CCNA, Net+
CCNP in the works