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GNS3 / gns3-gui

GNS3 Graphical Network Simulator
http://www.gns3.com
GNU General Public License v3.0
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Generated base mac breaks vEOS MLAG #2475

Closed CapnCheapo closed 6 years ago

CapnCheapo commented 6 years ago

2.1.4 with remote server

I have been having problems with getting MLAG to work on versions of Arista vEOS that used to work in GNS3. I finally realized this broke when the base mac address generation was redesigned in a previous GNS3 version.

MAC addresses seem to be generated with 52 in the first octet. In binary 0x52 = 1010010. The 2nd bit from the right, the U/L bit is set to 1, for local address. With this set, vEOS will never generate the virtual mac addresses it needs for MLAG and you will receive the following types of errors:

SW1#Apr 17 19:33:56 SW1 Mlag: %FWK-3-SOCKET_CLOSE_REMOTE: Connection to at tbt://10.0.0.2:4432/+n closed by peer (ECONNRESET when reading) Apr 17 19:33:56 SW1 Mlag: %FWK-3-MOUNT_PEER_CLOSED: Peer closed socket connection. (tbt://10.0.0.2:4432/+n-in)()

MLAG Status: state : Inactive/Reload (0:04:11 left)

By changing all my base mac addresses from 52 to 04 I have no issues getting MLAG to come up.

grossmj commented 6 years ago

For reference, the original issue why we changed to 0x52: https://github.com/GNS3/gns3-server/issues/1267

grossmj commented 6 years ago

You are right about 0x52, somehow I missed the U/L bit is set to 1. I think I will go with 0x0C = 00001100 by default which is easily recognisable and gives no matches on https://www.wireshark.org/tools/oui-lookup.html

grossmj commented 6 years ago

Fixed by https://github.com/GNS3/gns3-server/commit/fff2e128ebafaf51d49ca55bba16fe14344753ee