strange LACP behavior between cisco 3750 and juniper ex4300

[jbigrow]

I have a juniper ex4300 configured with a bunch of vlans on an AE interface. connected to this I have a cisco 3750 switch.

the link AE to PC is setup with LACP. On the production cisco the link never comes up. neither the pc nor the gigE interface.

The juniper shows athe AE as down but the ge-0/2/0 interface as up. I've checked the config several times and both sides match

native vlan, the vlans themselfs. the are both set to active active. nothing I can think of gets the link to come up......

here's the funny thing. I took a spare cisco 3750 switch with the same version ios and the config from the production cisco and put it on the spare 3750, AND IT WORKS JUST AS IT SHOULD with the Juniper. I tried moving the port to gi-1/0/2 from 1/0/10 I tried  deconfig of the port channel and physical interface. the physical interface then the port channel. no difference.

the juniper shows the ae (port channel) as down but the physical ge-0/2/0 as up. lacp counted show tx packets from the juniper but no receive from the cisco

anyone have any ideas why the production switch doesn't come up?, yes I changed the optics, had the fiber tested, even moved to a different sfp slot on the production cisco 3750. still won't come up.....

any help appreciated

[acampbell]

Hi,

When you try to shut then open the ports/channel on the cisco 3750 do you see any loggs you could share ?

[Ruben Cocheno]

@jbigrow 

can you share the configs?

[Georg Pauwen]

Hello,

could be related to spanning tree. On the Cisco, run PVSTP, and on the Juniper RSTP. Or disable spanning tree altogether on both switches. Does a single port to a single port (no port channel) work ?

[paul driver]

hello

@Georg Pauwen  i would strongly suggest  not to disable spanning tree on a production switch especially when dual connecting to another production switch this is asking for trouble!

[jbigrow]

keep in mode the literally exact cisco config works in a different 3750

!--------------------------- cisco side ----------------------------------------
!
spanning-tree mode rapid-pvst
spanning-tree loopguard default
spanning-tree extend system-id
!
!
!vlan internal allocation policy ascending
!
vlan 171
name guest
!
vlan 269
name vendl4
!
vlan 270
name 130.199.218.0/24
!
vlan 271
name 130.199.219.0/24
!
vlan 272
name 130.199.220.0/24
!
vlan 273
name 130.199.221.0/24
!
vlan 274
name 130.199.222.0/24
!
vlan 275
name 130.199.223.0/24
!
vlan 399
name 10.251.118.0/24
!
vlan 441
name 10.251.124.0/29
!
vlan 442
name 10.251.124.16/28
!
vlan 641
name 10.251.120.0/24
!
vlan 642
name 10.251.121.0/24
!
vlan 643
name 10.251.122.0/24
!
vlan 644
name 10.251.123.0/24
!
vlan 2404
name 10.251.252.0/24
!
vlan 2406
name 10.251.250.0/24
!
vlan 2408
name 10.251.248.0/24
!
vlan 2410
name 10.251.246.0/24
!
vlan 2412
name 10.251.244.0/24
!
vlan 2414
name 10.251.242.0/24
!
vlan 2420
name 10.251.236.0/24
!
vlan 3404
name 10.251.4.0/24
!
vlan 3406
name 10.251.6.0/24
!
vlan 3408
name 10.251.8.0/24
!
vlan 3410
name 10.251.10.0/24
!
vlan 3412
name 10.251.12.0/24
!
vlan 3414
name 10.251.14.0/24

!
interface Port-channel42
description
switchport trunk encapsulation dot1q
switchport trunk native vlan 641
switchport trunk allowed vlan 171,270-275,399,441,442,641-644,2404,2406,2408
switchport trunk allowed vlan add 2410,2412,2414,2420,3404,3406,3408,3410,3412
switchport trunk allowed vlan add 3414
switchport mode trunk
switchport nonegotiate
spanning-tree link-type point-to-point
!
interface GigabitEthernet1/0/2
description
switchport trunk encapsulation dot1q
switchport trunk native vlan 641
switchport trunk allowed vlan 171,270-275,399,441,442,641-644,2404,2406,2408
switchport trunk allowed vlan add 2410,2412,2414,2420,3404,3406,3408,3410,3412
switchport trunk allowed vlan add 3414
switchport mode trunk
switchport nonegotiate
udld port disable
no cdp enable
spanning-tree link-type point-to-point
channel-group 42 mode active
!

------------------------------- juniper side ------------------------------------------

set interfaces ge-0/2/0 description
set interfaces ge-0/2/0 ether-options 802.3ad ae0
set interfaces ae0 description
set interfaces ae0 native-vlan-id 641
set interfaces ae0 aggregated-ether-options minimum-links 1
set interfaces ae0 aggregated-ether-options lacp active
set interfaces ae0 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members 171
set interfaces ae0 unit 0 family ethernet-switching vlan members 270-275
set interfaces ae0 unit 0 family ethernet-switching vlan members 399
set interfaces ae0 unit 0 family ethernet-switching vlan members 441-442
set interfaces ae0 unit 0 family ethernet-switching vlan members 641-644
set interfaces ae0 unit 0 family ethernet-switching vlan members 2404
set interfaces ae0 unit 0 family ethernet-switching vlan members 2406
set interfaces ae0 unit 0 family ethernet-switching vlan members 2408
set interfaces ae0 unit 0 family ethernet-switching vlan members 2410
set interfaces ae0 unit 0 family ethernet-switching vlan members 2412
set interfaces ae0 unit 0 family ethernet-switching vlan members 2414
set interfaces ae0 unit 0 family ethernet-switching vlan members 2420
set interfaces ae0 unit 0 family ethernet-switching vlan members 3404
set interfaces ae0 unit 0 family ethernet-switching vlan members 3406
set interfaces ae0 unit 0 family ethernet-switching vlan members 3408
set interfaces ae0 unit 0 family ethernet-switching vlan members 3410
set interfaces ae0 unit 0 family ethernet-switching vlan members 3412
set interfaces ae0 unit 0 family ethernet-switching vlan members 3414
set interfaces ae0 unit 0 family ethernet-switching recovery-timeout 60

set protocols vstp interface ae0 mode point-to-point

et protocols vstp vlan 1
set protocols vstp vlan 171
set protocols vstp vlan 2404
set protocols vstp vlan 2406
set protocols vstp vlan 2408
set protocols vstp vlan 2410
set protocols vstp vlan 2412
set protocols vstp vlan 2414
set protocols vstp vlan 2420
set protocols vstp vlan 270
set protocols vstp vlan 271
set protocols vstp vlan 272
set protocols vstp vlan 273
set protocols vstp vlan 274
set protocols vstp vlan 275
set protocols vstp vlan 3404
set protocols vstp vlan 3406
set protocols vstp vlan 3408
set protocols vstp vlan 3410
set protocols vstp vlan 3412
set protocols vstp vlan 3414
set protocols vstp vlan 399
set protocols vstp vlan 441
set protocols vstp vlan 442
set protocols vstp vlan 641
set protocols vstp vlan 642
set protocols vstp vlan 643
set protocols vstp vlan 644

[Georg Pauwen]

Hello,

the configs are by the book.Can you post the output of 'sh ver' of both 3750 switches ?

[jbigrow]

Load for five secs: 10%/4%; one minute: 14%; five minutes: 12%
Time source is NTP, 15:24:24.697 EDT Fri Sep 11 2020
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE10, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Mon 18-Jul-16 01:28 by prod_rel_team

ROM: Bootstrap program is C3750E boot loader
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(58r)SE, RELEASE SOFTWARE (fc1)

 uptime is 3 years, 52 weeks, 4 hours, 32 minutes
System returned to ROM by power-on
System restarted at 12:03:19 EDT Tue Sep 13 2016
System image file is "flash:c3750e-universalk9-mz.150-2.SE10.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
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If you require further assistance please contact us by sending email to
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License Level: ipservices
License Type: Permanent
Next reload license Level: ipservices

cisco WS-C3750X-12S (PowerPC405) processor (revision A0) with 524288K bytes of memory.
Processor board ID FDO1641P013
Last reset from power-on
2 Virtual Ethernet interfaces
1 FastEthernet interface
16 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address : E4:D3:F1:8E:6A:00
Motherboard assembly number : 73-13329-03
Motherboard serial number : FDO1640099U
Model revision number : A0
Motherboard revision number : B0
Model number : WS-C3750X-12S-S
Daughterboard assembly number : 800-32727-03
Daughterboard serial number : FDO16400Y5V
System serial number : FDO1641P013
Top Assembly Part Number : 800-35090-02
Top Assembly Revision Number : B0
Version ID : V02
CLEI Code Number : CMMFG00ARB
Hardware Board Revision Number : 0x04

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 18 WS-C3750X-12S 15.0(2)SE10 C3750E-UNIVERSALK9-M

Configuration register is 0xF

[Georg Pauwen]

Hello, 

post the 'sh ver' of the other switch as well. Which one is the working, and which one the non-working switch ?

[Ruben Cocheno]

@jbigrow 

something that got my attention wasa the 3 year uptime, maybe a reboot and/or update to the latest version might help. I do not see any problems with the config.