Cabletron Systems HSIM-W6 Guía de instalación descargar pdf (Pagina 43)

Investigating Software Configuration Problems

HSIM-W84 Installation Guide 4-7

User Cannot Communicate with Remote Network Station

If Bridging,

• Check that the Bridging Default Destination is set.

• Check that bridging to/from the remote router is set on.

• Be sure to reboot if you have made any bridging destination or control changes.

If TCP/IP Routing,

• Check that TCP/IP Routing is set on and is enabled at the remote end.

• Check that the IP address of the LAN beyond the remote router is correct, as well as the

associated Subnet Mask.

• If the remote router WAN IP address and Subnet Mask are required, check that they have been

speciﬁed correctly.

• Check that, if required, the source and remote WAN IP addresses are on the subnetwork.

• Check that you have seeded the routing table, if RIP is not allowed to ﬂow on the WAN link.

• Be sure to reboot if you have made any IP address, control or protocol option changes.

Troubleshooting the Frame Relay Connection

There are three troubleshooting tools available. The ﬁrst has always been available and is LM. The

second is the FR Error MIB Table, and reﬂects LMI or DLCI data errors. The third is new and is

available as the Mib Nav command: “fr”.

Communication with the FR switch is done through one of two methods:

Asynchronous Status Messages — At any time the Fr Switch can send an unsolicited (no

polling from us) message to us. Each message contains information on one DLCI and one only. It

has the DLCI number and the DLCI state. We don’t respond to this message, but we do adjust what

we know about DLCIs based on this information.

Synchronous Polling Messages — The t391 timer for the ANSI/ITU Frame Relay forms the

basis for polling between the FR switch and the FR DTE (us). We transmit a STATUS ENQUIRY

every t391 seconds (10 by default) to the FR switch. We expect a STATUS RESPONSE, which

contains information on the DLCIs the switch has assigned to us. Every other t391 cycle we sent

out a LINK INTEGRITY VERIFICATION ENQUIRYmessage (LIV). We expect to get a LINK

INTEGRITY VERIFICATION RESPONSE back from the Fr switch before out t391 polling cycle

expires. This is a keep alive message that does no more than let us know the link between us and

the FR switch is still alive.

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Cabletron Systems HSIM-W6 Guía de instalación Pagina 43