Hello,
I ran into problem when I configured Q in Q by following the instructions from this site,
http://www.gns3.net/articles/ccie-routi ... ch-option/ and see the odd problem that come from the gns3 router ping to real switch.
Topology:
Code:
version = 0.8.7
[127.0.0.1:7208]
workingdir = /tmp
udp = 10801
[[3725]]
image = /Volumes/media/Kickstart/cisco/c3725/C3725-AD.BIN
idlepc = 0x60753be0
sparsemem = True
[[ROUTER R2]]
model = 3725
console = 2102
aux = 2502
cnfg = configs/R2.cfg
f0/0 = SW1 2
x = -293.0
y = -22.0
z = 1.0
[127.0.0.1:7200]
workingdir = /tmp
udp = 10001
[[ETHSW SW1]]
2 = access 102 R2 f0/0
24 = dot1q 1 nio_gen_eth:en1
x = -110.5
y = -15.0
z = 1.0
[GNS3-DATA]
configs = configs
[[NOTE 1]]
text = "f0/0"
x = 11.6096668809
y = 56.8837879492
interface = R2 f0/0
[[NOTE 2]]
text = "2"
x = -16.1096668809
y = 27.1162120508
interface = SW1 2
[[NOTE 3]]
text = "nio_gen_eth:en1"
x = -19.4998724626
y = 56.3989902211
interface = C1 nio_gen_eth:en1
[[Cloud C1]]
symbol = multilayer_switch
x = 97.5
y = -22.0
z = 1.0
connections = SW1:24:nio_gen_eth:en1
Cloud connect to breakout switch at port 48.
# breakout switch
Code:
system mtu routing 1998
vtp mode transparent
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
vlan dot1q tag native
!
vlan 102
!
interface FastEthernet0/3
description Downlink to SW01
switchport access vlan 102
switchport mode dot1q-tunnel
speed 100
duplex full
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
no cdp enable
spanning-tree portfast
!
interface FastEthernet0/48
description Uplink to MacPRO
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-102
switchport mode trunk
speed 100
duplex full
l2protocol-tunnel cdp
l2protocol-tunnel stp
l2protocol-tunnel vtp
no cdp enable
spanning-tree portfast trunk
!
breakout switch connect to access switch with crossover cat6 cable at port 3.
Code:
interface FastEthernet0/3
switchport trunk encapsulation dot1q
switchport mode trunk
speed 100
duplex full
spanning-tree portfast
!
Here is router config.
Code:
!
interface FastEthernet0/0
no ip address
speed 100
full-duplex
!
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 10.2.10.1 255.255.255.0
no snmp trap link-status
!
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 10.2.20.1 255.255.255.0
no snmp trap link-status
!
I configure SPAN to observe the traffic from breakout.
When I switch on gns3 and real switch, both SW1 and R2 can be able to see CDP traffic fine.
Code:
R2#sh cdp ne
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW1 Fas 0/0 131 S I WS-C3560-4Fas 0/3
R2 Fas 0/0 179 R S I 3725 Fas 0/0
Code:
R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.2.10.1 - c200.025d.0000 ARPA FastEthernet0/0.10
Internet 10.2.20.1 - c200.025d.0000 ARPA FastEthernet0/0.20
Internet 10.2.20.254 30 0015.63c7.1ac3 ARPA FastEthernet0/0.20
Internet 10.2.10.254 31 0015.63c7.1ac2 ARPA FastEthernet0/0.10
Code:
SW1#sh cdp ne
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
R2 Fas 0/3 152 R S I 3725 Fas 0/0
SW1#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.2.10.254 - 0015.63c7.1ac2 ARPA Vlan10
Internet 10.2.20.1 32 c200.025d.0000 ARPA Vlan20
Internet 10.2.20.254 - 0015.63c7.1ac3 ARPA Vlan20
When I start pinging from R2 to SW1, problem starts.
ping to R1
Code:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.2.10.1, timeout is 2 seconds:
...!
01:31:22: ICMP: echo reply rcvd, src 10.2.10.1, dst 10.2.10.254, topology BASE, dscp 0 topoid 0.
Success rate is 20 percent (1/5), round-trip min/avg/max = 17/17/17 ms
try again, I got the same result. I can *always* see 1-2 ping reply from R1 router. either result is 20-40% succcessful...
Code:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.2.10.1, timeout is 2 seconds:
!
01:38:58: ICMP: echo reply rcvd, src 10.2.10.1, dst 10.2.10.254, topology BASE, dscp 0 topoid 0...!
Success rate is 40 percent (2/5), round-trip min/avg/max = 17/21/26 ms
SW1#
01:39:04: ICMP: echo reply rcvd, src 10.2.10.1, dst 10.2.10.254, topology BASE, dscp 0 topoid 0
ping to SW1 from R2 and observe with debug icmp flag on
switch replied with this:
Code:
01:32:58: ICMP: echo reply sent, src 10.2.10.254, dst 10.2.10.1, topology BASE, dscp 0 topoid 0
01:33:00: ICMP: echo reply sent, src 10.2.10.254, dst 10.2.10.1, topology BASE, dscp 0 topoid 0
01:33:02: ICMP: echo reply sent, src 10.2.10.254, dst 10.2.10.1, topology BASE, dscp 0 topoid 0
from tcpdump:
9:00:35.566919 IP (tos 0x0, ttl 255, id 40, offset 0, flags [none], proto ICMP (1), length 100)
10.2.10.1 > 10.2.10.254: ICMP echo request, id 8, seq 0, length 80
09:00:35.569652 IP (tos 0x0, ttl 255, id 40, offset 0, flags [none], proto ICMP (1), length 100)
10.2.10.254 > 10.2.10.1: ICMP echo reply, id 8, seq 0, length 80
but, R2 show ICMP failed.
Code:
R2#ping s10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.2.10.254, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
I use native lan port from mac pro to breakout and configure with 100 Mb/s full duplex.
I have no idea what happens why the ping failed from both end.
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