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802.1ag utilities
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INTRODUCTION ------------ The IEEE 802.1ag standard is a set of protocols for Ethernet OAM (Operations, Administration, and Management). The dot1ag-utils software package is an Open Source (new BSD License) implementation of the IEEE 802.1ag protocol and is supported on Arista Networks switches and Linux, FreeBSD and MacOSX servers. It provides several debugging tools that interact with IEEE 802.1ag enabled routers and switches. The package implements a loopback message initiator (ethping), a link trace message initiator (ethtrace) and a daemon (dot1agd) that responds to loopback messages and link trace messages. Sending and receiving of continuity check messages is implemented in the dot1ag_ccd daemon. Currently, the dot1ag-utils implement the Down MEP functionality only. The main focus at the moment is a setup where the dot1ag-utils are run on an interface of a server which is connected to an Ethernet switch. USE CASES --------- (1) Ping and trace to Ethernet MAC addresses from a server. MIP 00:14:0d:0b:10:c4 MEP | 00:1b:c0:97:38:c6 | | V V +--------+ +--------+ +----------------+ +----------------+ | server +-------+ switch +-----+ 802.1ag switch +----+ 802.1ag switch | +--------+ +--------+ +----------------+ +----------------+ server# ethping -ieth5 -v123 -l7 -c5 00:14:0d:0b:10:c4 Sending CFM LBM to 00:14:0d:0b:10:c4 64 bytes from 00:14:0d:0b:10:c4, sequence 209175278, 4.256 ms 64 bytes from 00:14:0d:0b:10:c4, sequence 209175279, 0.410 ms 64 bytes from 00:14:0d:0b:10:c4, sequence 209175280, 0.412 ms 64 bytes from 00:14:0d:0b:10:c4, sequence 209175281, 0.410 ms 64 bytes from 00:14:0d:0b:10:c4, sequence 209175282, 0.440 ms server# ethtrace -i eth5 -v 123 -l7 00:1b:c0:97:38:c6 Sending CFM LTM probe to 00:1b:c0:97:38:c6 ttl 1: LTM with id 284917984 reply from 00:14:0d:0b:10:c1, id=284917984, ttl=0, RlyFDB ttl 2: LTM with id 284917985 reply from 00:14:0d:0b:10:c1, id=284917985, ttl=1, RlyFDB reply from 00:14:0d:0b:10:c4, id=284917985, ttl=0, RlyFDB ttl 3: LTM with id 284917986 reply from 00:14:0d:0b:10:c1, id=284917986, ttl=2, RlyFDB reply from 00:14:0d:0b:10:c4, id=284917986, ttl=1, RlyFDB reply from 00:1b:c0:97:38:c6, id=284917986, ttl=0, RlyHit ----------------------------------------- (2) Connect a server to a switch and let the server respond to Ethernet ping and trace messages. dot1agd +--------+ | server | +---+----+ | v1 v1 +----------------+ v1 +---+----+ v1 +----------------+ ---------+ 802.1ag switch +-------+ switch +-------+ 802.1ag switch +----- +----------------+ +--------+ +----------------+ The server is connected to the middle switch on VLAN v1. It can interact with IEEE 802.1ag enabled switches. So you can L2 ping and trace to the middle server (the server will respond) even though the switch does not support 802.1ag itself. When you also run the dot1ag_ccd daemon on the server, this setup can send and receive continuity check messages too. The advantage is that the server is connected to the switch at L2 only. It does not need an IP address. So the security risk is minimal. The server cannot be hacked via IP protocols. SUPPORTED PLATFORMS ------------------- The 8021ag-utils have been tested on: Arista Networks EOS 4.7.3 CentOS 5.6 FreeBSD 8.x MacOSX 10.6.7, 10.7 NetBSD Ubuntu 10.04.2 LTS Interoperability tests have been done with: Actelis Alcatel Cisco C3750-ME 12.2(55)SE Juniper T1600 JUNOS 10.3I Nortel MERS 8600 6.0.4.0OE CONTACT INFORMATION ------------------- Please send questions, bugs, patches, etc to [email protected] or [email protected]. You can also join the mailman mailing list: https://horus.sara.nl/mailman/listinfo/dot1ag-utils The dot1ag-utils can be downloaded from: http://nrg.sara.nl/dot1ag-utils
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