IEEE 802.1ag Ethernet OAM
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1 IEEE 802.1ag OAM Ronald van der Pol SARA
2 Outline! IEEE 802.1ag protocol! Open Source implementation of 802.1ag! Examples and use cases
3 IEEE 802.1ag standard! Part of Operations, Administration & Maintenance! IEEE 802.1ag is used for Connectivity Fault Management! CFM protocol at layer! Uses frames (ethertype 0x8902)! No IPv4 or IPv6 involved! Confined to one broadcast domain! Useful for multi-domain networks! Implemented on es and router interfaces
4 802.1ag Concepts! network split into Maintenance Domains! 802.1ag frames run at a certain Maintence Domain Level! Maintenance Points send and process 802.1ag frames! Maintenance End Points (MEPs)! Maintenance Intermediate Points (MIPs)! MEPs and MIPs only interact at the same MD Level! Interfaces can be a MEP at one level and a MIP at another
5 IEEE 802.1ag OAM Types! Continuity Check (CC)! Detect loss of connectivity! Periodic hello messages from MEPs! Processed by MEPs! CC frames sent to multicast group, no replies are sent! Loopback Message/Reply (LBM/LBR)! Check for reachability! Sent manually from MEPs via CLI! Processed by MIPs/MEPs! Unicast request, unicast reply! Link Trace Message/Reply (LTM/LTR)! Path information! Sent manually from MEPs via CLI! Processed by MIPs/MEPs in path! Multicast request including TTL, unicast replies
6 Continuity Check Messages! Periodic hello messages, supported intervals:! 3.33 ms, 10 ms, 100 ms, 1 s, 10 s, 1 min, 10 min! Maintenance Association with 2 or more MEPs! No replies sent, only listen to associated MEPs! Same Maintenance Association! Same Maintenance Domain Name! Same Maintenance Domain Level! Failure detection when missing 3 consecutive messages
7 802.1ag MEPs and MIPs MIP MEP Maintenance Domain Levels /router /router MD level 7 MD level 5 MD level 3 MD level 0
8 Maintenance Domain Levels Maintenance Domain 7 Maintenance Domain 5 Maintenance Domain 0
9 What are the dot1ag-utils?! Open Source implementation of IEEE 802.1ag! Simplified BSD License! Supported on Arista, FreeBSD, Linux and MacOSX! User space implementation! Work In Progress! Powerful debugging tool for based lightpaths, VPNs, etc.! No need to configure IP addresses on each VLAN on es! Ping to MAC addresses of routers and es! You only need a server and install the software on it
10 Dot1ag-utils tools! ethping: send Loopback Messages (LBM)! ethtrace: send Linke Trace Messages (LTM)! dot1agd: daemon that responds to LBM and LTM messages! Dot1ag_ccd: daemon that periodically sends Continuity Check Messages (CCMs) and processes CCMs from other MEPs
11 Release Schedule! BETA1 available since May , looking for:! Code reviewers! Beta testers with FreeBSD, Linux or MacOSX servers! Beta testers with 802.1ag routers and es! First release in Summer 2011
12 Current Status (2011/06/07)! Ethping (works and interoperates with Cisco, Juniper and Nortel MERS)! Ethtrace (works and interoperates with Cisco, Juniper and Nortel MERS)! Dot1agd (works and interoperates with Cisco, Juniper and Nortel MERS)! Dotag_ccd: Work in progress, minimal implementation; sends CCMs every second, parses received CCMs
13 ethping demo MEP MIP Juniper router Ciena Linux server "donder" 00:14:0d:0b:10:c4 00:1b:c0:97:38:c6 00:14:0d:0b:11:10 00:14:0d:0b:10:c0 00:14:0d:0b:10:c1 ethping -i eth5 -v 123 -l 7 -c 10 00:1b:c0:97:38:c6 CFM LBM to 00:1b:c0:97:38:c6 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms 60 bytes from 00:1b:c0:97:38:c6, sequence , ms root@donder:~#
14 ethtrace demo MEP MIP Juniper router Ciena Linux server "donder" 00:14:0d:0b:10:c4 00:1b:c0:97:38:c6 00:14:0d:0b:11:10 00:14:0d:0b:10:c0 00:14:0d:0b:10:c1 ethtrace -i eth5 -v 123 -l 7 00:1b:c0:97:38:c6 Sending CFM LTM probe to 00:1b:c0:97:38:c6 ttl 1: LTM with id reply from 00:14:0d:0b:10:c1, id= , ttl=0, RlyFDB ttl 2: LTM with id reply from 00:14:0d:0b:10:c4, id= , ttl=0, RlyFDB reply from 00:14:0d:0b:10:c1, id= , ttl=1, RlyFDB ttl 3: LTM with id reply from 00:14:0d:0b:10:c4, id= , ttl=1, RlyFDB reply from 00:14:0d:0b:10:c1, id= , ttl=2, RlyFDB reply from 00:1b:c0:97:38:c6, id= , ttl=0, RlyHit root@donder:~#
15 LBM from Juniper to Arista MEP MIP Juniper router Ciena Arista Linux server "donder" 00:14:0d:0b:10:c4 00:1b:c0:97:38:c6 00:14:0d:0b:11:10 00:14:0d:0b:10:c0 00:14:0d:0b:10:c1 dot1ag-utils daemon 00:1C:73:08:11: JUNOS 10.3I built :23:14 UTC test 00:1C:73:08:11:84 PING to 00:1c:73:08:11:84, Interface ge-0/3/ bytes from 00:1c:73:08:11:84: lbm_seq=81 64 bytes from 00:1c:73:08:11:84: lbm_seq=82 64 bytes from 00:1c:73:08:11:84: lbm_seq=83 64 bytes from 00:1c:73:08:11:84: lbm_seq= ping statistics packets transmitted, 4 packets received, 0% packet loss rvdp@re0-ed>
16 ethping Amsterdam to Chicago Northwestern University SARA server Arista StarLight NetherLight Arista Linux server "donder" dot1ag-utils daemon 00:1c:73:08:09:80 dot1ag-utils daemon 00:1C:73:08:11:84 donder# ethping -i eth5 -v 400 -l 7 00:1c:73:08:09:80 Sending CFM LBM to 00:1c:73:08:09:80 60 bytes from 00:1c:73:08:09:80, sequence , ms 60 bytes from 00:1c:73:08:09:80, sequence , ms 60 bytes from 00:1c:73:08:09:80, sequence , ms 60 bytes from 00:1c:73:08:09:80, sequence , ms 60 bytes from 00:1c:73:08:09:80, sequence , ms #
17 Server as Proxy for Switch dot1agd daemon v1, v2, v3 v1, v2 v3 v1 v2, v3 Juniper
18 More Information! Mail to or Subscribe to mailman mailing list
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