Check your cisco side configs, that config looks like a cisco
"unconditional channel", not a lacp channel.
channel-group 1 mode on == HARD ETHER CHANNEL
channel-group 1 mode active == Active LACP or PAGP (depends on platform)
Some will need
channel-protocol lacp
channel-group 1 mode active
others default to lacp
[email protected] wrote:
I'm not terribly well versed in ex configuration, ( I think we're still
evaluating them) but it looks like you are trying to negotiate on the ex
end and then have it set on the cisco side so there may be a point in time
when the links aren't aggergated on the juniper side where traffic is
looped.
From:
Alexandre Snarskii <[email protected]>
To:
Juniper-NSP Mailing list <[email protected]>
Date:
03/18/2009 01:43 PM
Subject:
[j-nsp] ex-series: etherchannel bpdu loop ?
Sent by:
[email protected]
Hi!
After power failure on one of our pop's we faced strange problem:
etherchannel between juniper ex-4200 and cisco 2960g started to
flap. By logs I saw that Cisco determined 'etherchannel
misconfiguration' condition, shuts down both ports of channel,
then, after errdisable timeout, tried to set them up, but then
again detects etherchannel misconfiguration and so on and on...
By Cisco documentation, etherchannel misconfiguration means
that BPDU's sent on one ports of etherchannel returned back
via another port. And forwarding of those BPDU from one
LAG member interface to another (rstp is disabled on juniper)
smells like an error in JunOS...
Workaround: delete interfaces from LAG on Juniper, commit,
add interfaces to LAG, commit.
PS: Configuration is pretty straightforward on both sides:
Juniper:
s...@sw006-201> show configuration interfaces ae0
aggregated-ether-options {
minimum-links 1;
link-speed 1g;
}
unit 0 {
family ethernet-switching {
port-mode trunk;
vlan {
members all;
}
}
}
s...@sw006-201> show configuration interfaces ge-0/0/15
ether-options {
speed {
1g;
}
802.3ad ae0;
}
s...@sw006-201> show configuration protocols
[....]
stp {
disable;
}
rstp {
disable;
}
mstp {
disable;
}
Cisco:
Cisco#show runn int po1
interface Port-channel1
switchport mode trunk
mvr type source
Cisco#show runn int gi 0/23
interface GigabitEthernet0/23
switchport mode trunk
load-interval 30
channel-group 1 mode on
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