08-25-2011 09:50 AM - edited 03-04-2019 01:24 PM
Hi,
I have 2 3550's connected across a wireless link.
Switch A:
interface FastEthernet0/24
description downlink to switch B
no switchport
ip address 10.1.3.1 255.255.255.248
!
ip route 10.1.3.8 255.255.255.248 10.1.3.4
Switch B:
interface FastEthernet0/1
description UPLINK to Switch A
no switchport
ip address 10.1.3.4 255.255.255.248
!
interface FastEthernet0/2
description downlink to Switch C
no switchport
ip address 10.1.3.9 255.255.255.248
!
ip route 0.0.0.0 0.0.0.0 10.1.3.1
All ports are up/up
However, from Switch A, I cannot reach 10.1.3.9
Can this 3550 not route traffic between 2 routed ports?
I know I've done this before...
The problematic switch has IOS version 12.1(22)EA4
-- James
08-25-2011 10:01 AM
James,
Routing appears to be correct & 3550 should be able to route b.w them. Couple of things I want to verify:
Can you ping from Switch A (10.1.3.1) to switch B (10.1.3.4)?
"ip routing" is enabled on both switches?
Please share the o/p of "show ip route 10.1.3.9" from switch A & "show ip route" from Switch B.
We can debug & see what's wrong with it.
create an ACL for debugging purpose:
Use a number in ACL that doesn't exist on the switch.
ip access-list ex 191
permit ip host 10.1.3.1 host 10.1.3.9
permit ip host 10.1.3.9 host 10.1.3.1
debug ip packet 191 detail
Paste the o/p & we can identify what's wrong & where it is wrong.
Regards,
Amit
08-25-2011 10:18 AM
Hi Amit,
SWITCH_A#ping 10.1.3.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.3.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
ip routing is enabled on both
SWITCH_A#sh ip route 10.1.3.9
Routing entry for 10.1.3.8/29
Known via "static", distance 1, metric 0
Routing Descriptor Blocks:
* 10.1.3.4
Route metric is 0, traffic share count is 1
SWITCH_B#sh ip route
Gateway of last resort is 10.1.3.1 to network 0.0.0.0
10.0.0.0/29 is subnetted, 2 subnets
C 10.1.3.8 is directly connected, FastEthernet0/2
C 10.1.3.0 is directly connected, FastEthernet0/1
S* 0.0.0.0/0 [1/0] via 10.1.3.1
Debugging from SWITCH_A
Aug 25 10:13:18.804: FIBipv4-packet-proc: route packet from (local) src 10.1.3.1 dst 10.1.3.9
Aug 25 10:13:18.804: FIBfwd-proc: Default:10.1.3.8/29 proces level forwarding
Aug 25 10:13:18.804: FIBfwd-proc: depth 0 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:18.804: FIBfwd-proc: try path 0 (of 1) v4-rnh-10.1.3.4[v4:Default] first short ext 0(-1)
Aug 25 10:13:18.804: FIBfwd-proc: v4-rnh-10.1.3.4[v4:Default] valid
Aug 25 10:13:18.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 0 if none nh 10.1.3.4 deag 0 via fib 204A568 path type recursive nexthop
Aug 25 10:13:18.804: FIBfwd-proc: depth 1 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:18.804: FIBfwd-proc: try path 0 (of 1) v4-adp-10.1.3.4-Fa0/24 first short ext 0(-1)
Aug 25 10:13:18.804: FIBfwd-proc: v4-adp-10.1.3.4-Fa0/24 valid
Aug 25 10:13:18.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 deag 0 via fib 0 path type adjacency prefix
Aug 25 10:13:18.808: FIBfwd-proc: packet routed to FastEthernet0/24 10.1.3.4(0)
Aug 25 10:13:18.808: FIBipv4-packet-proc: packet routing succeeded
Aug 25 10:13:18.808: IP: tableid=0, s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), routed via FIB
Aug 25 10:13:18.808: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0
Aug 25 10:13:18.808: FIBfwd-proc: sending link IP ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0 rec 0
Aug 25 10:13:18.808: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending
Aug 25 10:13:18.808: ICMP type=8, code=0
Aug 25 10:13:18.808: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending full packet
Aug 25 10:13:18.808: ICMP type=8, code=0
Aug 25 10:13:20.804: FIBipv4-packet-proc: route packet from (local) src 10.1.3.1 dst 10.1.3.9
Aug 25 10:13:20.804: FIBfwd-proc: Default:10.1.3.8/29 proces level forwarding
Aug 25 10:13:20.804: FIBfwd-proc: depth 0 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:20.804: FIBfwd-proc: try path 0 (of 1) v4-rnh-10.1.3.4[v4:Default] first short ext 0(-1)
Aug 25 10:13:20.804: FIBfwd-proc: v4-rnh-10.1.3.4[v4:Default] valid
Aug 25 10:13:20.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 0 if none nh 10.1.3.4 deag 0 via fib 204A568 path type recursive nexthop
Aug 25 10:13:20.804: FIBfwd-proc: depth 1 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:20.804: FIBfwd-proc: try path 0 (of 1) v4-adp-10.1.3.4-Fa0/24 first short ext 0(-1)
Aug 25 10:13:20.804: FIBfwd-proc: v4-adp-10.1.3.4-Fa0/24 valid
Aug 25 10:13:20.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 deag 0 via fib 0 path type adjacency prefix
Aug 25 10:13:20.804: FIBfwd-proc: packet routed to FastEthernet0/24 10.1.3.4(0)
Aug 25 10:13:20.804: FIBipv4-packet-proc: packet routing succeeded
Aug 25 10:13:20.804: IP: tableid=0, s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), routed via FIB
Aug 25 10:13:20.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0
Aug 25 10:13:20.804: FIBfwd-proc: sending link IP ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0 rec 0
Aug 25 10:13:20.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending
Aug 25 10:13:20.804: ICMP type=8, code=0
Aug 25 10:13:20.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending full packet
Aug 25 10:13:20.808: ICMP type=8, code=0
Aug 25 10:13:22.804: FIBipv4-packet-proc: route packet from (local) src 10.1.3.1 dst 10.1.3.9
Aug 25 10:13:22.804: FIBfwd-proc: Default:10.1.3.8/29 proces level forwarding
Aug 25 10:13:22.804: FIBfwd-proc: depth 0 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:22.804: FIBfwd-proc: try path 0 (of 1) v4-rnh-10.1.3.4[v4:Default] first short ext 0(-1)
Aug 25 10:13:22.804: FIBfwd-proc: v4-rnh-10.1.3.4[v4:Default] valid
Aug 25 10:13:22.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 0 if none nh 10.1.3.4 deag 0 via fib 204A568 path type recursive nexthop
Aug 25 10:13:22.804: FIBfwd-proc: depth 1 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:22.804: FIBfwd-proc: try path 0 (of 1) v4-adp-10.1.3.4-Fa0/24 first short ext 0(-1)
Aug 25 10:13:22.804: FIBfwd-proc: v4-adp-10.1.3.4-Fa0/24 valid
Aug 25 10:13:22.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 deag 0 via fib 0 path type adjacency prefix
Aug 25 10:13:22.804: FIBfwd-proc: packet routed to FastEthernet0/24 10.1.3.4(0)
Aug 25 10:13:22.804: FIBipv4-packet-proc: packet routing succeeded
Aug 25 10:13:22.804: IP: tableid=0, s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), routed via FIB
Aug 25 10:13:22.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0
Aug 25 10:13:22.804: FIBfwd-proc: sending link IP ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0 rec 0
Aug 25 10:13:22.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending
Aug 25 10:13:22.804: ICMP type=8, code=0
Aug 25 10:13:22.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending full packet
Aug 25 10:13:22.808: ICMP type=8, code=0
Aug 25 10:13:24.804: FIBipv4-packet-proc: route packet from (local) src 10.1.3.1 dst 10.1.3.9
Aug 25 10:13:24.804: FIBfwd-proc: Default:10.1.3.8/29 proces level forwarding
Aug 25 10:13:24.804: FIBfwd-proc: depth 0 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:24.804: FIBfwd-proc: try path 0 (of 1) v4-rnh-10.1.3.4[v4:Default] first short ext 0(-1)
Aug 25 10:13:24.804: FIBfwd-proc: v4-rnh-10.1.3.4[v4:Default] valid
Aug 25 10:13:24.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 0 if none nh 10.1.3.4 deag 0 via fib 204A568 path type recursive nexthop
Aug 25 10:13:24.804: FIBfwd-proc: depth 1 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:24.804: FIBfwd-proc: try path 0 (of 1) v4-adp-10.1.3.4-Fa0/24 first short ext 0(-1)
Aug 25 10:13:24.804: FIBfwd-proc: v4-adp-10.1.3.4-Fa0/24 valid
Aug 25 10:13:24.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 deag 0 via fib 0 path type adjacency prefix
Aug 25 10:13:24.804: FIBfwd-proc: packet routed to FastEthernet0/24 10.1.3.4(0)
Aug 25 10:13:24.804: FIBipv4-packet-proc: packet routing succeeded
Aug 25 10:13:24.804: IP: tableid=0, s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), routed via FIB
Aug 25 10:13:24.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0
Aug 25 10:13:24.804: FIBfwd-proc: sending link IP ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0 rec 0
Aug 25 10:13:24.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending
Aug 25 10:13:24.804: ICMP type=8, code=0
Aug 25 10:13:24.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending full packet
Aug 25 10:13:24.808: ICMP type=8, code=0
Aug 25 10:13:26.804: FIBipv4-packet-proc: route packet from (local) src 10.1.3.1 dst 10.1.3.9
Aug 25 10:13:26.804: FIBfwd-proc: Default:10.1.3.8/29 proces level forwarding
Aug 25 10:13:26.804: FIBfwd-proc: depth 0 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:26.804: FIBfwd-proc: try path 0 (of 1) v4-rnh-10.1.3.4[v4:Default] first short ext 0(-1)
Aug 25 10:13:26.804: FIBfwd-proc: v4-rnh-10.1.3.4[v4:Default] valid
Aug 25 10:13:26.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 0 if none nh 10.1.3.4 deag 0 via fib 204A568 path type recursive nexthop
Aug 25 10:13:26.804: FIBfwd-proc: depth 1 first_idx 0 paths 1 long 0(0)
Aug 25 10:13:26.804: FIBfwd-proc: try path 0 (of 1) v4-adp-10.1.3.4-Fa0/24 first short ext 0(-1)
Aug 25 10:13:26.804: FIBfwd-proc: v4-adp-10.1.3.4-Fa0/24 valid
Aug 25 10:13:26.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 deag 0 via fib 0 path type adjacency prefix
Aug 25 10:13:26.804: FIBfwd-proc: packet routed to FastEthernet0/24 10.1.3.4(0)
Aug 25 10:13:26.804: FIBipv4-packet-proc: packet routing succeeded
Aug 25 10:13:26.804: IP: tableid=0, s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), routed via FIB
Aug 25 10:13:26.804: FIBfwd-proc: ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0
Aug 25 10:13:26.804: FIBfwd-proc: sending link IP ip_pak_table 0 ip_nh_table 65535 if FastEthernet0/24 nh 10.1.3.4 uhp 1 deag 0 ttlexp 0 rec 0
Aug 25 10:13:26.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending
Aug 25 10:13:26.804: ICMP type=8, code=0
Aug 25 10:13:26.804: IP: s=10.1.3.1 (local), d=10.1.3.9 (FastEthernet0/24), len 100, sending full packet
Aug 25 10:13:26.808: ICMP type=8, code=0
SWITCH_B doesn't have any output.
It seems as though the packets aren't making it over the wireless link, yet pinging 10.1.3.4 works fine.
The link is set up as a transparent bridge.
08-25-2011 10:44 AM
It for sure looks like that the packets aren't reaching the Switch B over the link. Either they are getting dropped in b/w or on the interface Fa0/1 on Switch B.
To verify that you could simply edit & put the ACL 191 on the fa0/1 interface of Switch B.
On Switch B:
undebug all
no ip access-list ex 191
ip access-list ex 191
permit ip host 10.1.3.1 host 10.1.3.9 log
permit ip host 10.1.3.9 host 10.1.3.1 log
permit ip any any
int fa0/1
ip access-group 191 in
ip access-group 191 out
Please share the following o/p from switches.
Switch B:
show run
sho int fa0/1
sho int fa0/2
Switch A:
show run
show int fa0/24
08-25-2011 10:57 AM
Switch_B:
ip subnet-zero
ip routing
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
description UPLINK to 9191
no switchport
ip address 10.1.3.4 255.255.255.248
ip access-group 191 in
ip access-group 191 out
!
interface FastEthernet0/2
description downlink to 9940
no switchport
ip address 10.1.3.9 255.255.255.248
...
interface Vlan1
no ip address
shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.1.3.1
ip http server
!
access-list 191 permit ip host 10.1.3.1 host 10.1.3.9 log
access-list 191 permit ip host 10.1.3.9 host 10.1.3.1 log
access-list 191 permit ip any any
08-25-2011 11:02 AM
FastEthernet0/1 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 000d.ed3a.a880 (bia 000d.ed3a.a880)
Description: UPLINK to 9191
Internet address is 10.1.3.4/29
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1000 bits/sec, 1 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
77609 packets input, 7452187 bytes, 0 no buffer
Received 72208 broadcasts (0 IP multicast)
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 72163 multicast, 0 pause input
0 input packets with dribble condition detected
25189 packets output, 3674789 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
FastEthernet0/2 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 000d.ed3a.a880 (bia 000d.ed3a.a880)
Description: downlink to 9940
Internet address is 10.1.3.9/29
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
62614 packets input, 6247772 bytes, 0 no buffer
Received 62592 broadcasts (0 IP multicast)
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 62546 multicast, 0 pause input
0 input packets with dribble condition detected
20471 packets output, 2902376 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
08-25-2011 11:03 AM
SWITCH_A:
ip subnet-zero
ip routing
no ip domain-lookup
!
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
...
interface FastEthernet0/24
description downlink to SWITCH_B
no switchport
ip address 10.1.3.1 255.255.255.248
!
ip classless
ip route 0.0.0.0 0.0.0.0 another.gateway
ip route 10.1.3.8 255.255.255.248 10.1.3.4
FastEthernet0/24 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0011.5c58.0f80 (bia 0011.5c58.0f80)
Description: downlink to 18111 Brookhurst
Internet address is 10.1.3.1/29
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 0/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:04, output 00:00:07, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
807719 packets input, 454026965 bytes, 0 no buffer
Received 17105 broadcasts (0 IP multicasts)
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 17000 multicast, 0 pause input
0 input packets with dribble condition detected
689590 packets output, 147832650 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
08-25-2011 11:09 AM
From Switch A, "ping 10.1.3.9 source 10.1.3.4" or use extended ping to specify the source IP.
Once you do that, do you see any hits in the ACL 191 on the SwitchB?
If yes, then the packet is getting there. If no, the packet is getting dropped in b/w & would need to check the wireless connection
08-25-2011 11:14 AM
I do not see anything in the logs on switch B.
The wireless connection is configured as a transparent bridge, so I'm not sure why it is dropping packets to 10.1.3.9 but allowing them to 10.1.3.4 (the 2 access point IPs are 10.1.3.2 and 10.1.3.3)
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