FR-ATM interworking issue lab1.

Objetivo: simular el problema existente en redes WAN con interworking frame-relay/atm para cuando la subinterface frame-relay del lado del cliente tiene aplicada QoS y no tiene comunicación con el otro extremo.

Topología:

Frame-relay switch:

ATM switch:

Frrouter:

hostname Frrouter
!
ip dhcp pool test
network 10.1.2.0 255.255.255.0
default-router 10.1.2.1
domain-name cisco.com
dns-server 10.1.2.254
lease 7
!
no ip domain lookup
!
class-map match-all test
match access-group 101
class-map match-all test-ch
match ip dscp af31
!
policy-map output
class test-ch
bandwidth 60
class class-default
bandwidth 30
policy-map FR-128
class class-default
shape average 121600 1216 0
service-policy output
policy-map input
class test
set ip dscp af31
class class-default
set ip dscp default
!
interface Serial1/0
bandwidth 128
no ip address
encapsulation frame-relay IETF
serial restart-delay 0
clock rate 128000 //QoS que incluye fragmentación a 160 bytes.
!
interface Serial1/0.1 point-to-point
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 102
class MAP-FR-128
!
interface FastEthernet2/0
ip address 10.1.2.1 255.255.255.0
duplex auto
speed auto
service-policy input input
!
router eigrp 1
network 10.0.0.0
no auto-summary
!
map-class frame-relay MAP-FR-128
frame-relay fragment 160
frame-relay fair-queue
service-policy output FR-128
access-list 101 permit icmp any any
!
line con 0
logging synchronous

InterwRtr:

hostname InterwRtr
!
no ip domain lookup
!
interface Serial1/0
bandwidth 128
no ip address
encapsulation frame-relay IETF
serial restart-delay 0
clock rate 128000
frame-relay interface-dlci 101 switched
!
interface ATM2/0
mtu 1500
no ip address
no atm ilmi-keepalive
pvc 1/100
encapsulation aal5mux fr-atm-srv
!
connect frf8 Serial1/0 101 ATM2/0 1/100 service-interworking
!
line con 0
logging synchronous

Explicación:

ATMRouter:

hostname ATMRouter
!
no ip domain lookup
!
interface ATM1/0
mtu 1500
no ip address
no atm ilmi-keepalive
!
interface ATM1/0.1 multipoint
ip address 10.1.1.2 255.255.255.0
pvc 2/200
protocol ip 10.1.1.1 broadcast
encapsulation aal5snap
!
interface FastEthernet2/0
ip address 10.1.3.1 255.255.255.0
duplex auto
speed auto
!
router eigrp 1
network 10.0.0.0
no auto-summary
!
line con 0
logging synchronous

Comprobación del interworking:

-InterwRtr#sh connection all

ID Name Segment 1 Segment 2 State
============================================================================================
1 frf8 Se1/0 101 ATM2/0 1/100 UP

-InterwRtr#sh connection id 1

FR/ATM Service Interworking Connection: frf8
Status – UP
Segment 1 – Serial1/0 DLCI 101
Segment 2 – ATM2/0 VPI 1 VCI 100
Interworking Parameters –
service translation
efci-bit 0
de-bit map-clp
clp-bit map-de

-InterwRtr#sh frame-relay pvc

PVC Statistics for interface Serial1/0 (Frame Relay DTE)

Active Inactive Deleted Static
Local 0 0 0 0
Switched 1 0 0 0
Unused 0 0 0 0

DLCI = 101, DLCI USAGE = FRF.8, PVC STATUS = ACTIVE, INTERFACE = Serial1/0

input pkts 259 output pkts 113 in bytes 18108
out bytes 7657 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
switched pkts 259
Detailed packet drop counters:
no out intf 0 out intf down 0 no out PVC 0
in PVC down 0 out PVC down 0 pkt too big 0
shaping Q full 0 pkt above DE 0 policing drop 0

-InterwRtr#sh atm pvc
VCD / Peak Avg/Min Burst
Interface Name VPI VCI Type Encaps SC Kbps Kbps Cells Sts
2/0 1 1 100 PVC FRATMSRV UBR 155000 UP

Comprobación del enlace:

-Frrouter#sh ip eigrp neighbors
IP-EIGRP neighbors for process 1
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.1.1.2 Se1/0.1 12 00:07:44 48 288 0 5

-Frrouter#sh ip route
Codes: C – connected, S – static, R – RIP, M – mobile, B – BGP
D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area
N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2
E1 – OSPF external type 1, E2 – OSPF external type 2
i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2
ia – IS-IS inter area, * – candidate default, U – per-user static route
o – ODR, P – periodic downloaded static route

Gateway of last resort is not set

10.0.0.0/24 is subnetted, 3 subnets
D 10.1.3.0 [90/2172416] via 10.1.1.2, 00:05:14, Serial1/0.1
C 10.1.2.0 is directly connected, FastEthernet2/0
C 10.1.1.0 is directly connected, Serial1/0.1

Comprobación de la incompatibilidad del frf.12 (fragmentación) con el interworking (frf.8)

Con Qos aplicado:

FRrouter
!
interface Serial1/0.1 point-to-point
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 102
class MAP-FR-128
!
map-class frame-relay MAP-FR-128
frame-relay fragment 160 (160 bytes)
frame-relay fair-queue
service-policy output FR-128
!

-Frrouter#ping 10.1.3.1 source fastEthernet 2/0 size 140
Type escape sequence to abort.
Sending 5, 140-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.2.1
!!!!! (perfecto, ahora a probar con un size mayor de 160, donde se ejecuta la fragmentación)

-Frrouter#ping 10.1.3.1 source fastEthernet 2/0 size 300
Type escape sequence to abort.
Sending 5, 300-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.2.1
….. (Aquí radica el problema,Demostrado!)
Success rate is 0 percent (0/5)

Sin Qos aplicado:

!
interface Serial1/0.1 point-to-point
ip address 10.1.1.1 255.255.255.0
frame-relay interface-dlci 102
!

-Frrouter#ping 10.1.3.1 source fastEthernet 2/0 size 140
Type escape sequence to abort.
Sending 5, 140-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.2.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/43/56 ms

-Frrouter#ping 10.1.3.1 source fastEthernet 2/0 size 300
Type escape sequence to abort.
Sending 5, 300-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.2.1
!!!!! (Una vez quitada la QoS vuelve la conexión,anja!)
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/40/52 ms

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