SNR S2989G-24TX-POE — layer 2 Services Configuration and BPDU Tunnel Overview [102/553]

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S2989G-24TX Operation Manual Chapter 2 Layer 2 services

Configuration

Check whether OAM entities of two peers of link in passive mode. If so, EFM OAM

connection can not be established between two OAM entities.

 Ensuring SNMP configuration is correct, or else errored event can not be reported

to network management system.

 Link does not normally communicate in OAM loopback mode, it should cancel

remote loopback in time after detect the link performance.

 Ensuring the used board supports remote loopback function.

 Port should not configure STP, MRPP, ULPP, Flow Control, loopback detection

functions after it enables OAM loopback function, because OAM remote loopback

function and these functions are mutually exclusive.

 When enabling OAM, the negotiation of the port will be disabled automatically. So

the negotiation in the peer of the link must be disabled, otherwise the link

connection will unsuccessful. When disabling OAM, the negotiation of the port will

be restored. Therefore, to ensure the link connection is normal, the negotiations

must be accordant in two peers of the link.

 After enabling OAM, when the link negotiations in two peers are successful, the

state is up. After the fiber in RX redirection of the peer is pulled out, TX of the peer

and RX with OAM are normal, so the port with OAM will be at up state all along.

2.9

bpdu-tunnel

2.9.1

Introduction to bpdu-tunnel

BPDU Tunnel is a Layer 2 tunnel technology. It allows Layer 2 protocol packets of

geographically dispersed private network users to be transparently transmitted over

specific tunnels across a service provider network.

2.9.1.1 bpdu-tunnel function

In MAN application, multi-branches of a corporation may connect with each other by

the service provider network. VPN provided by the service provider enables the

geographically dispersed networks to form a local LAN, so the service provider needs to

provide the tunnel function, namely, data information generated by user’s network is able

to inextenso arrive at other networks of the same corporation through the service provider

network. To maintain a local concept, it not only needs to transmit the data within the

user’s private network across the tunnel, but also transmit layer 2 protocol packets within

the user’s private network.