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Community Member

Routing problem

I am using a router to connect remote equipment to a frame relay network. One WIC card is configured to connect with the frame relay equipment and another WIC card is configured to connect with the remote equipment (PPP protocol).

When the remote equipment is getting a message from the frame relay network via the router, sometime it looks like this:

[PPP header][IP Header][UDP datagramm][PPP footer]

and some time it looks like this:

[PPP header][IP Header][UDP datagramm] 0x55 0x55 ... 0x55 0x55 [PPP footer]

The remote equipment can not handle the second option with the 0x55 padding.

Can the router be configured to remove the padding?

2 REPLIES
Community Member

Re: Routing problem

Interesting! The only thing I saw about 0x55 is using it to fill up unused time slots (see http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/pamct3.htm).

Are you routing or running ppp over frame? I believe if you are routing (L3) at some point, all layer 2 encapsulation issues shouldn't have an impact between both media. Good luck!

Community Member

Re: Routing problem

Thanks

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