From: Justin Menga (Justin.Menga@xxxxxxxxxxxxxxxxxx)
Date: Tue Dec 12 2000 - 07:51:55 GMT-3
Hi,
You certainly can specify fragment size per PVC and you can run different
fragment sizes between the two as it is a point-to-point process and
transparent to the rest of the network.
All you need is separate map classes for each PVC as shown below. The
frame-relay fragment xxxx command is used.
Note - the vofr data 4 call-control 5 command enables FRF.11 fragmentation.
If you omit this command, FRF.12 fragmentation is used. FRF.11 is better as
voice is separated into CIDs within the PVC (confusing, but basically a form
of QoS for frame).
Your spoke routers MUST use the same FRF.11/12 fragmentation, otherwise you
won't even get any connectivity (don't do this remotely across the link!!!)
e.g.
R1 (Hub ROuter)
int s0
encaps frame
frame-relay traffic-shaping
int s0.1 point
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 100
vofr data 4 call-control 5
class R2
int s0.2 point
ip address 10.2.1.1 255.255.255.0
frame-relay interface-dlci 100
vofr data 4 call-control 5
class R3
map-class frame R2
frame-relay cir xxxx
....
....
frame-relay fragment xxxx
map-class frame R3
frame-relay cir xxxx
....
....
frame-relay fragment xxxx
R2 (Spoke Router)
int s0
encaps frame
frame-relay traffic-shaping
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 100
vofr data 4 call-control 5
class R1
map-class frame R1
frame-relay cir xxxx
....
....
frame-relay fragment xxxx
Regards,
Justin
-----Original Message-----
From: Claudio Laurentino Da Silva [mailto:claudio.laurentino@cpm.com.br]
Sent: Tuesday, December 12, 2000 1:55 PM
To: 'ccielab@groupstudy.com'
Subject: frame relay fragmentation
In a hub and spoke design connected by frame relay, each spoke with a vofr
cisco and data link, with link speed from 64k to 256k. We will have some
fragmentation values to each spoke site/ each dlci, but if the hub site is a
tandem switch, each spoke can call any other spoke.
1. Can I configure diferent fragment sizes for each spoke/ each dlci?
2. Can I make a call betweem spokes with diferent fragment sizes or need I
to configure the same size in all the spokes (which one, the smallest or the
biggest)?
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