Jason, This is mostly likely due to the fact that SCCP is getting fragmented on one end and the other end isn't expecting that. When I break fragmentation in this way, I also find phones won't re-register after a restart. Also, TFTP would be broken in this scenario.
Oh, it is worth noting that SCCP will try to pack as many "events" in a packet as possible. Wireshark will help you see this happening. Place a call to or from a phone and I suspect you will see what I mean. -Bill -- William Bell blog: http://ucguerrilla.com twitter: @ucguerrilla On Feb 27, 2013, at 4:39 PM, Jason Aarons wrote: > Odd things happen if you have “one-direction” fragmentation. Say for example > at Branch1 you leave off fragment. If you call from headquarters to Branch1 > the phone will ring but you can’t answer it. But at Branch1 I can call out. > Then later the phones at Branch1 lose their Line Text Labels. > > Why does this 1 way fragmentation cause the bizzard Branch1 phone behavior? > What is actually happening to create the bizarre problems at Branch1? Why > does fragmentation have to be both directions? > > I’m going to Wireshark the back of Branch1 phone to dig into this deeper. I > know both sides have to match, but why? > > > Example > Branch1#note the missing frame-relay fragment on purpose > map-class frame-relay AutoQoS-FR-Se0/1/0-202 > frame-relay cir 364800 > frame-relay bc 3640 > frame-relay be 0 > frame-relay mincir 364800 > service-policy output AutoQoS-Policy-Trust > > HQ# > map-class frame-relay AutoQoS-FR-Se0/1/0-101 > frame-relay cir 364800 > frame-relay bc 3640 > frame-relay be 0 > frame-relay mincir 364800 > frame-relay fragment 480 > service-policy output AutoQoS-Policy-Trust > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
