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Home > Archive > CCNA > September 2003 > Frame Relay
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| martek 2003-09-15, 9:43 pm |
| I was wondering if anyone could give an answer to the following question with an explanation:
Frame relay is configured over a point-to-point connection between two routers. The output of the 'show frame-relay pvc' command indicates that the status of the PVC is inactive. Which of the following sources could be the problem? (choose two):
a. local router
b. local frame relay switch
c. remote router
d. remote frame relay switch
This question has me puzzled (which is very rare). Any ideas?  | |
| vitaliysnet 2003-09-16, 3:29 am |
| Well even though I am not an expert, but I will try to explain. First of all I think that the answers are a and b. B is because, if you configure a non compatible LMI type there is three [cisco, ansi, q933a] that is different then what your Frame-Relay local switch supports, you wont get your PVC up. But in IOS releases 11.2 or later the LMI type is autosensed. Then for A is this explanation, if you assign an ip address for your physical serial interface, you have to remove the network-layer address assigned to the physical interface, and if the physical interface has an address, frames will not be recievid by the local subinterfaces. Thats if you had a subinterface, but when you only have a one point-to-point conncetion, on your physical interface, not on your subinterface, then the problem will either be a clock rate, or the [no shutdown] command havent been typed.(Considering answer A). All of this info I got from, Cisco Press Books and Wendell Odom. | |
| Yankee 2003-09-16, 4:46 am |
| This is from Cisco which I used in a paper I wrote some time ago:
The PVC can have four possible states. These are shown by the PVC STATUS field as follows:
ACTIVE - PVC is up and functioning normally.
INACTIVE - PVC is not up end-to-end. This may be because either there is no mapping (or incorrect mapping) for the local DLCI in the frame-relay cloud or the remote end of the PVC is Deleted.
DELETED - Either the Local Management Interface (LMI) is not exchanged between the router and the local switch, or the switch does not have DLCI configured on the local switch.
STATIC - no keepalive configured on the frame-relay interface of the router. | |
| martek 2003-09-16, 9:46 am |
| Thanks for the input guys. I tend to agree with vitaliysnet that the answer is a and b.
I think the problem is purely a local one, something between the local router and the local frame relay switch (prolly an incorrect LMI type set on the router or an incorrect configuration of the switch). | |
| Yankee 2003-09-17, 6:22 pm |
| you better reread the definition of inactive I provided again.
Yankee |
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