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"frame-relay fragment XYZ" causes link to stop working

Hi people!

I have a strange problem regarding the "frame-relay fragment xyz" command. I have the following configuration:

interface Serial0/0

description R3926704: phy. FrameRelay-Interface (Se0/0)

bandwidth 512

no ip address

max-reserved-bandwidth 95

encapsulation frame-relay IETF

no ip mroute-cache

load-interval 30

no snmp trap link-status

no fair-queue

cdp enable

frame-relay traffic-shaping

frame-relay lmi-type q933a

end

!

interface Serial0/0.1 point-to-point

description YYY: FR-Verbindung zum YY(Se0/0.1)

bandwidth 512

ip address A.A.A.A B.B.B.B

frame-relay class egress_queue_512k

frame-relay interface-dlci 16

end

map-class frame-relay egress_queue_512k

frame-relay cir 486000

frame-relay bc 48600

frame-relay be 0

frame-relay mincir 486000

service-policy output egress_queue

... if i change the map-class to:

map-class frame-relay egress_queue_512k_voice

frame-relay cir 486000

frame-relay bc 4860

frame-relay be 0

frame-relay mincir 486000

service-policy output egress_queue

frame-relay fragment 53

... no traffic goes over the link any more. no telnet no other traffic. the strange thing is, that i can ping the router!??

does anyone know what's the problem here??

thanks for any help!!

Mario

3 REPLIES
Blue

Re: "frame-relay fragment XYZ" causes link to stop working

the recommended fragment size for a 486K link should be between 320bytes minimum and 640bytes maximum.

try this and let me know if it works.

technically the fragment size for a 486k link recommended would be 608bytes. (486/64x80bytes)

Blue

Re: "frame-relay fragment XYZ" causes link to stop working

the fact that your pings are probably default 32 bytes would be under the frag size of 53 which is why they would work fine.

test with ping size of 1500 bytes. i'm guessing those would fail with the config you have currently.

Blue

Re: "frame-relay fragment XYZ" causes link to stop working

also, this fragment size must be set on both sides of the link, the same size, even if the hub has a greater link speed than the spoke.

see this document for more info:

http://www.cisco.com/en/US/partner/tech/tk652/tk698/technologies_configuration_example09186a0080094af9.shtml#topic9

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