We have multiple remote locations connected by spoke and hub frame-relay. all our remote cities have 64k cir and 128k port, and all run on mc3810 with almost the exact same configuration with FRTS, cir/mincir of 64k, be 0, bc 640, fair-queue, no adaptive-shaping.
On three cities we connect to frame by serial0 connected to an external CSU/DSU. On the rest of the cities we connect through the built in MFT T1 controller. Under similar conditions we experience traffic-shaping drops on the cities with the external serial connections, but not on the cities with the built in MFT.
Our hub MC3810 has an internal MFT connection, and we do not experience drops sending traffic to any of the remote locations (serial or MFT). What can We do to improve the performance of the cities with serial connections (short of getting MFTs)?
here are two configs
##########################################
Config with external CSU/DSU (experiences outbound drops)
!
interface Serial0
description Frame-Relay connection to Toronto
no ip address
encapsulation frame-relay IETF
no fair-queue
no frag-pre-queueing
frame-relay traffic-shaping
frame-relay lmi-type ansi
hold-queue 1024 out
!
interface Serial0.500 point-to-point
bandwidth 128
ip address 192.168.251.18 255.255.255.252
no frag-pre-queueing
frame-relay interface-dlci 500 voice-encap 80
class FRS1
!
map-class frame-relay FRS1
frame-relay voice bandwidth 32000
frame-relay fragment 80
no frame-relay adaptive-shaping
frame-relay cir 64000
frame-relay bc out 640
frame-relay be out 0
frame-relay mincir 64000
frame-relay fair-queue
#############################################
Config with internal MFT (Works fine)
!
controller T1 0
framing esf
linecode b8zs
channel-group 1 timeslots 1-2 speed 64
!
interface Serial0
description Frame Relay Circuit
no ip address
shutdown
no fair-queue
hold-queue 1024 out
!
interface Serial0:1
no ip address
encapsulation frame-relay IETF
no fair-queue
no frag-pre-queueing
cdp enable
frame-relay traffic-shaping
frame-relay lmi-type ansi
!
interface Serial0:1.500 point-to-point
ip address 192.168.251.26 255.255.255.252
no frag-pre-queueing
frame-relay interface-dlci 500 voice-encap 80
class FRS1
!
map-class frame-relay FRS1
frame-relay fragment 80
no frame-relay adaptive-shaping
frame-relay cir 64000
frame-relay bc out 640
frame-relay be out 0
frame-relay mincir out 64000
frame-relay fair-queue
