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Frame-Relay problems


Cisco 2600 --- Nortel Passport/Frame-Relay -- Nortel Passport/Frame-Relay --- -- Cisco 1720

i had a 2Mbps ppp link between two branch offices, in the test that I perform, I use to have an average of 1.30 Mbps, now I’ve a frame-relay link with a CIR of 1.5 Mbps and in the same test I can’t obtain more than 450 Kbps in average, how can I improve/debug this value.

Cisco 3620 ----- Nortel Passport/Frame-Relay -- Nortel Passport/Frame-Relay --- IBM 2210

In another configuration I’ve problems when switching from ppp to frame-relay.

When I switch the configuration on the Cisco side I can put the PVC up, but after a while,

10 m/20m half an hour a start getting losses of packets in ping and the connections goes down, and I can’t put LMI to talk again, how can I debug this problem….



Re: Frame-Relay problems

#1 - first make sure that both links are clean (sh interface) of drops and errors. Next ensure that both sides do not have any buffer failures incrementing (sh buff). Next ensure that both sides are at least fast switching data (sh int stat and sh int switch). Next, you can check "sh fr pvc" to look for any FECNs or BECNs (network congestion) or dropped packets. If all that looks clear, then you may want to investigage the FR switch.

#2 - You can do some of the same above, as well as "sh fr lmi" to look for any invalid packets and to ensure that the number of Status Enq. Sent is equal to the number of Status msgs Rcvd. You should also verify that both ends are using the same LMI type.

New Member

Re: Frame-Relay problems

Also, look at your MTU. Set it low and see if you continue to have dropped packets

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