Maximum DLCI on an interface
Hi,
I am trying to find a Limit of Maximum DLCI can be configured on an interface.
Ref:1 http://www.cisco.com/en/US/tech/tk713/tk237/technologies_tech_note09186a008014f8a7.shtml#dlcilimit
according to this article you can calculate the DLCI = (MTU - 20) / 5 ...
but on the other page of Cisco ..
Ref:2 http://www.cisco.com/en/US/tech/tk713/tk237/technologies_tech_note09186a0080094183.shtml
says formula for ANSI LMI = (MTU - 13) / 5 & cisco LMI = (MTU - 13) / 8
My understanding is Ref1 is for Dynamic LMI, and Refernce 2 is for STATIC LMI. but in static with cisco LMI why IE jumped to 8 ?
Comments
Hi
It depends on the LMI type you are using so the formula comes out to be
The maximum number of DLCIs assigned on an interface by LMI are = (MTU - 13)/8 when LMI is CISCO OR = (MTU - 13)/5 when LMI is ANSI or Q933a
This is because Cisco LMI provides more overhead(8 Bytes) in the packet as compare to LMI type ANSI or Q933a overhead (5 Bytes) in the packet to accomodate DLCIs information.
Regards
Deepak
Not to change the subject,
but is there any possibility
that a router which is not produced by Cisco Systems
will be in the real exam topology?
Not at all...why this question?
Then,
(config-if)# encapsulation frame-relay ietf
would never be showed up in the exam.
No need to memorize, neither.
I am not sure I agree with your reasoning. Just because frame relay has an open standard encapsulation type, doesn't mean that you won't be tested on it. There are many things that aren't Cisco proprietary that are tested on on the CCIE lab exam. Suppose you had a requirement to configure your frame relay with an open standard encapsulation type. Maybe they'll ask you to use RFC 1490/2427 encapualtion just because they can.............
Ah, my mistake, sorry.
The name of the game is what they are asking.
And it is always tricky.
Right; Cisco may even simulate a Cisco router not being a Cisco router, they may ask you to configure a PVC to a BB device for example and ask for an open-standard encapsulation. So, even though, there is no non-Cisco equipment (and some being virtualized), you still need to know that you have an IETF and a Cisco encapsulation...
Right on.
Thanks for your reply.
No, there is no noon cisco devices in the lab
Who seconds?
Then the labo exam is contradicting itself.
""Set the following Cisco's router with non Cisco method."
Why is that a contradiction? There are many protocols where we have choices of Cisco or non-proprietary methods
I don't know which lab exam you're referring to, but it is clear that here they are asking you to use a non-proprietary method. Not a Juniper-specific, or HP-specific setting, but something that will work with Cisco and non-Cisco devices.
Thanks.
Let me reconsider.
My mistake, sorry, guys.
802.1q versus ISL war
has already proved I am wrong.