link UPDOWN messages

roncro · ‎09-10-2024

Hello,

I have a Cisco 2951 router and two Cisco 2960 switches. I see some link messages on the switches that my router doesn't seem to be too happy about.

2024-09-10T08:40:50.406566-06:00 192.168.2.3 542: Sep 10 14:40:49.403: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T08:40:50.406911-06:00 192.168.2.3 543: Sep 10 14:40:50.404: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T08:41:22.599905-06:00 192.168.2.3 544: Sep 10 14:41:21.596: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to down
2024-09-10T08:41:22.600246-06:00 192.168.2.3 545: Sep 10 14:41:22.597: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to down
2024-09-10T08:41:34.496244-06:00 192.168.2.3 546: Sep 10 14:41:33.492: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T08:41:34.496620-06:00 192.168.2.3 547: Sep 10 14:41:34.494: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T13:41:57.639131-06:00 192.168.2.3 548: .Sep 10 19:41:56.622: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to down
2024-09-10T13:41:59.639699-06:00 192.168.2.3 549: .Sep 10 19:41:58.635: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T13:42:34.633711-06:00 192.168.2.3 550: .Sep 10 19:42:33.628: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to down
2024-09-10T13:42:34.634050-06:00 192.168.2.3 551: .Sep 10 19:42:34.629: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to down
2024-09-10T13:42:47.012313-06:00 192.168.2.3 552: .Sep 10 19:42:46.007: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/3, changed state to up
2024-09-10T13:42:47.012700-06:00 192.168.2.3 553: .Sep 10 19:42:47.008: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/3, changed state to up

Any ideas on what could cause that?

thanks,

Ron

Richard Burts · ‎09-10-2024

Ron

You supply data without supplying any information about environment. Can you tell us what model (and perhaps what version of software) is running on the router? Can you tell us what model (and perhaps what version of software) is running on the switches?

HTH

Rick

roncro · ‎09-10-2024

this is what is on the switches (I think that is where the issue is)

#show version
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Thu 05-May-11 16:56 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x01B00000

ROM: Bootstrap program is Alpha board boot loader
BOOTLDR: C2960S Boot Loader (C2960S-HBOOT-M) Version 12.2(55r)SE, RELEASE SOFTWARE (fc1)

South uptime is 12 weeks, 2 days, 12 hours, 33 minutes
System returned to ROM by power-on
System restarted at 03:50:40 UTC Sun Jun 16 2024
System image file is "flash:/c2960s-universalk9-mz.122-55.SE3/c2960s-universalk9-mz.122-55.SE3.bin"

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

cisco WS-C2960S-24PS-L (PowerPC) processor (revision D0) with 131072K bytes of memory.
Processor board ID FOC1541Z371
Last reset from power-on
10 Virtual Ethernet interfaces
1 FastEthernet interface
28 Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : 24:B6:57:4A:AA:00
Motherboard assembly number : 73-11908-06
Power supply part number : 341-0393-02
Motherboard serial number : FOC15403GP2
Power supply serial number : DCA1532U3EY
Model revision number : D0
Motherboard revision number : A0
Model number : WS-C2960S-24PS-L
Daughterboard assembly number : 73-11933-04
Daughterboard serial number : FOC15393JNY
System serial number : FOC1541Z371
Top Assembly Part Number : 800-30945-02
Top Assembly Revision Number : C0
Version ID : V02
CLEI Code Number : COMGE00ARB
Daughterboard revision number : A0
Hardware Board Revision Number : 0x01

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 28 WS-C2960S-24PS-L 12.2(55)SE3 C2960S-UNIVERSALK9-M

Configuration register is 0xF

Giuseppe Larosa · ‎09-10-2024

Hello @roncro ,

post also a

show cdp neighbors

what is connected on the affected port gi1/0/3 ?

Is it a router interface ?

Hope to help

Giuseppe

roncro · ‎09-10-2024

here it is for both switches;

North#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID
South
Gig 1/0/28 149 S I WS-C2960S Gig 1/0/28
ap2 Gig 1/0/16 172 T AIR-AP112 Fas 0
ap7 Gig 1/0/13 122 T AIR-AP123 Fas 0
ap8 Gig 1/0/15 161 T AIR-AP123 Fas 0
ap-shark-2 Gig 1/0/14 126 T AIR-AP112 Fas 0
Charon-2951.central-plex.us
Gig 1/0/24 131 R B S CISCO2951 Gig 0/1.1
AP-TM-W-F7C033 Gig 1/0/22 134 T AIR-AP112 Fas 0

South#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID
North
Gig 1/0/28 126 S I WS-C2960S Gig 1/0/28
ap6 Gig 1/0/6 172 T AIR-AP123 Fas 0
ap9 Gig 1/0/2 130 T AIR-AP123 Fas 0
ap-seismo Gig 1/0/12 129 T AIR-AP112 Fas 0
anasa.localdomain
Gig 1/0/24 129 T AIR-AP112 Fas 0
ap1.localdomain Gig 1/0/4 127 T AIR-AP112 Fas 0

Richard Burts · ‎09-11-2024

Thanks for the cdp neighbor output. In the first switch I see a connection to router 2951 but in the second switch I do not see any router connection. Is that correct? Is that what you expected?

HTH

Rick

roncro · ‎09-11-2024

Hi Richard,

yes that is correct, the north switch is connected to the router, the south switch is connected to the north switch.

(btw: I noticed that after changing the domain name from localdomain, to an actual/real domain name I have, these messages are almost not occuring anymore, only saww 2 over the past 12 hours or so)

Richard Burts · ‎09-12-2024

Ron

In looking more carefully at this discussion I realize that we have a mistake in our understanding. We have been assuming that the issue is about the connection of switch to router. But looking at the OP the affected interface is GigabitEthernet1/0/3. That is NOT the connection to the router. So what is connected on that interface?

HTH

Rick