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 _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
