Inter Vlan Routing dropping Ping

I have an issue with inter vlan routing. When I ping 172.16.37.7(SW3) from R1 I get between 40 to 50 percent success rate. I'm able to ping 172.16.10.0 network from R1 without any dropping
have the following Connections:

R1 connect to SW1 with switchport dot1q allowing vla 10 and 37.

R1 Config:

interface Ethernet1/1
 no ip address
 full-duplex
!
interface Ethernet1/1.10
 encapsulation dot1Q 10
 ip address 172.16.10.6 255.255.255.0
 ip ospf hello-interval 5
!
interface Ethernet1/1.37
 encapsulation dot1Q 37
 ip address 172.16.37.6 255.255.255.0

SW1 Config

interface FastEthernet0/6
 description router_1_connection
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,37
 switchport mode trunk
 switchport nonegotiate
 duplex full
end

SW1 Connects to SW3

SW1 config to SW3

interface FastEthernet0/19
 switchport access vlan 37
 switchport mode access
end

SW3 Vlan 37 IP

interface Vlan37
 ip address 172.16.37.7 255.255.255.0
end

is any reason why i dropping pings?

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Comments

RouteMyPacket

Real equipment or no? L2 switches? You're a CCNP right? What are your thoughts?

amb1s1

Real Equipment, routers are 2600 and switches are 3550s. yes ccnp. My first thought was that it was an issue with duplex miss match, but after i check all the interfaces i discard that as a problem. I see not collision on the interfaces.

Jackace

What does the config look like on SW3 for the port connected to SW1? Do you have the default gateway set on SW3? What does the rest of the config look like on each device? What's the arp table and mac table look like on all 3 devices? Are both tables stable or do you see entries coming and going or changing sporadically?

fredrikjj

If it's 50% success rate maybe the routing is messed up and you are load balancing between two interfaces where only 1 reaches the destination.

joeypants05

Is spanning tree solid between the switches or do you see the states changing frequently? Are there any errors on the interfaces along the path? Did you check the speeds of all interfaces to make sure they match up?

deth1k

set speed to 10M on the switch?

Fitzi

Check your ip is not assigned to another interface in addition to the one you are using. If this is not the case clear the interface counters and check for errors, otherwise try alternate cables.

amb1s1

Jackace wrote: »

What does the config look like on SW3 for the port connected to SW1? Do you have the default gateway set on SW3? What does the rest of the config look like on each device? What's the arp table and mac table look like on all 3 devices? Are both tables stable or do you see entries coming and going or changing sporadically?

Sw3 to sw1

interface FastEthernet0/19
 switchport access vlan 37
 switchport mode access
end

R1 Full Config

version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R6
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
!
!
!
no ip domain lookup
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
!
!

!
ip tcp synwait-time 5
!
!
!
!
!
interface Loopback106
 ip address 172.16.106.1 255.255.255.255
!
interface Loopback666
 ip address 6.6.6.6 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0
 no ip address
 encapsulation frame-relay
!
interface Serial0/1
 no ip address
 encapsulation frame-relay
!
interface Ethernet1/0
 no ip address
 half-duplex
!
interface Ethernet1/1
 description SW1 Connection
 no ip address
 full-duplex
!
interface Ethernet1/1.10
 encapsulation dot1Q 40
 ip address 172.16.10.6 255.255.255.0
 ip ospf hello-interval 5
!
interface Ethernet1/1.37
 encapsulation dot1Q 37
 ip address 172.16.37.6 255.255.255.0
!
interface Ethernet1/2
 no ip address
 shutdown
 half-duplex
!
interface Ethernet1/3
 no ip address
 shutdown
 half-duplex
!
router ospf 1
 log-adjacency-changes
 area 16 virtual-link 172.16.101.1
 network 172.16.160.6 0.0.0.0 area 16
 network 172.16.37.6 0.0.0.0 area 67
 network 172.16.106.1 0.0.0.0 area 16
!
ip forward-protocol nd
!
!
ip http server
no ip http secure-server
!
!
!
!
control-plane
!

!
!
line con 0
 privilege level 15
line aux 0
line vty 0 4
 login
!
!
end

SW1

version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname SW1
!
!
no aaa new-model
ip subnet-zero
ip routing
no ip domain-lookup
!
vtp domain wilson
vtp mode transparent
!
!
crypto pki trustpoint TP-self-signed-564258688
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-564258688
 revocation-check none
 rsakeypair TP-self-signed-564258688
!
!
crypto pki certificate chain TP-self-signed-564258688
 certificate self-signed 01
  3082023A 308201A3 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
  30312E30 2C060355 04031325 494F532D 53656C66 2D536967 6E65642D 43657274
  69666963 6174652D 35363432 35383638 38301E17 0D393330 33303130 30303035
  395A170D 32303031 30313030 30303030 5A303031 2E302C06 03550403 1325494F
  532D5365 6C662D53 69676E65 642D4365 72746966 69636174 652D3536 34323538
  36383830 819F300D 06092A86 4886F70D 01010105 0003818D 00308189 02818100
  CCD5AAC9 61B0F7E0 1B708F12 5188C470 86599884 CC65E852 701D9ED4 E5722583
  B581B8BB 41EA7F00 3607157C 7C7D78E2 D65C0800 699CA9D8 8D1D7024 0A9F65AD
  9DEBA87B C2FE1D63 43C588FB DAA8663D 42C7FA24 AFC0D3C9 78BE5B00 B96AA4C1
  13CD58BC 80A44079 50621BBB 01EDA70B B85C97EE B5E381D8 15108471 BD7914ED
  02030100 01A36430 62300F06 03551D13 0101FF04 05300301 01FF300F 0603551D
  11040830 06820453 57312E30 1F060355 1D230418 30168014 2EB7A3EA D4379A64
  E77C437A 54587FA4 04F88CF9 301D0603 551D0E04 1604142E B7A3EAD4 379A64E7
  7C437A54 587FA404 F88CF930 0D06092A 864886F7 0D010104 05000381 81006DFF
  FCB26229 1B6D840B F5D73FA5 A1D3C9A8 AF240C51 7F668782 41A16228 AEA1C5CE
  207017A7 0FDA3C24 807747CA B14BF163 5368EBB1 8916984C B4813044 324509A3
  C05FC460 D4975DDF B1DEEF91 60A3EC09 288D54FA 7289F3ED 03CF5602 63AADF64
  1D33FAE2 0D954F5C 8CDE03F5 D95EB15D 3B254D42 A5469BD1 9D42F9AA 56A0
  quit
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 10
 name NET-10
!
vlan 20
 name NET-20
!
vlan 30
 name NET-30
!
vlan 37
 name NET-37
!
vlan 40
 name NET-40
!
vlan 50
 name NET-50
!
vlan 60
 name NET-60
!
vlan 700
 name NET-700
!
vlan 800
 name NET-800
!
vlan 3000
 name NET-3000
!
ip tcp synwait-time 5
!
!
!
!
!
interface Loopback110
 ip address 172.16.110.129 255.255.255.128
!
interface Loopback505
 ip address 172.16.50.5 255.255.255.252
!
interface Loopback509
 ip address 172.16.50.9 255.255.255.252
!
interface Loopback513
 ip address 172.16.50.13 255.255.255.252
!
interface FastEthernet0/1
 switchport mode dynamic desirable
!
interface FastEthernet0/2
 switchport access vlan 10
 switchport mode access
!
interface FastEthernet0/3
 switchport access vlan 30
 switchport mode access
!
interface FastEthernet0/4
 switchport mode dynamic desirable
!
interface FastEthernet0/5
 switchport access vlan 20
 switchport mode access
!
interface FastEthernet0/6
 description connection_to_R6
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,37
 switchport mode trunk
 switchport nonegotiate
 speed 10
 duplex full
!
!
interface FastEthernet0/19
 description connection_to_sw3
 switchport access vlan 37
 switchport mode access
!
interface FastEthernet0/20
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/21
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/22
 switchport mode dynamic desirable
!
interface FastEthernet0/23
 description connection_to_sw2
 switchport trunk encapsulation isl
 switchport trunk allowed vlan 10
 switchport mode trunk
 switchport nonegotiate
!
interface FastEthernet0/24
 description connection_to-sw2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,20,30,37,40,50,60,700,800,3000
 switchport mode trunk
 switchport nonegotiate
!
interface GigabitEthernet0/1
 switchport mode dynamic desirable
!
interface GigabitEthernet0/2
 switchport mode dynamic desirable
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan30
 ip address 172.16.34.10 255.255.255.0
!
router rip
 version 2
 network 172.16.0.0
!
ip classless
ip http server
ip http secure-server
!
!
!
control-plane
!
!
line con 0
 privilege level 15
line vty 0 4
 login
line vty 5 15
 login
!
end

Sw3

version 12.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname SW3
!
!
no aaa new-model
ip subnet-zero
ip routing
no ip domain-lookup
!
vtp domain wilson
vtp mode transparent
!
!
crypto pki trustpoint TP-self-signed-1606380800
 enrollment selfsigned
 subject-name cn=IOS-Self-Signed-Certificate-1606380800
 revocation-check none
 rsakeypair TP-self-signed-1606380800
!
!
crypto pki certificate chain TP-self-signed-1606380800
 certificate self-signed 01
  3082023C 308201A5 A0030201 02020101 300D0609 2A864886 F70D0101 04050030
  31312F30 2D060355 04031326 494F532D 53656C66 2D536967 6E65642D 43657274
  69666963 6174652D 31363036 33383038 3030301E 170D3933 30333031 30303031
  31375A17 0D323030 31303130 30303030 305A3031 312F302D 06035504 03132649
  4F532D53 656C662D 5369676E 65642D43 65727469 66696361 74652D31 36303633
  38303830 3030819F 300D0609 2A864886 F70D0101 01050003 818D0030 81890281
  8100C81B 8DF74FC8 91432FCA 27963F42 74E5A5B5 1F668407 69FAF380 1C3C91AB
  D68356ED 10160A6D B8741947 BC9AEE96 3FB082F1 F2D364CE 31D58F93 6E90FCD5
  F91D38F2 0EB81D9B D13AE098 4E5A7A26 2FF04BF1 38B66439 4F72326A 02AC0751
  38F9B3F3 201CD589 60DBA57B EE3F7ECA A7712A6F 9830E185 909BA5C0 15999697
  C0D70203 010001A3 64306230 0F060355 1D130101 FF040530 030101FF 300F0603
  551D1104 08300682 04535733 2E301F06 03551D23 04183016 80145262 2C36BB5C
  EFCEAB36 FC119A29 C6F860DF 8D26301D 0603551D 0E041604 1452622C 36BB5CEF
  CEAB36FC 119A29C6 F860DF8D 26300D06 092A8648 86F70D01 01040500 03818100
  BC9BFB26 786C5D85 63FF1A38 06B0CDE2 7CEE7D5D D3EF995B 9566D109 B097EA86
  C0EAC504 87631A4F 5BC7F4A5 D6802E8B 8D897DCF BEB9B6AF 9202E971 4652B229
  B75EC4E2 DB9E8D4C F15D41D3 017D1AFC 3606A6C9 BA0EFF35 5DF678AF 9504B4AD
  A17D312D 70C1820F 97971814 EFB96BB7 F069A0ED DFADB724 8B4826A8 81CAE8D3
  quit
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
vlan internal allocation policy ascending
!
vlan 100-102
!
vlan 3000
 name NET-3000
!
ip tcp synwait-time 5
!
!
!
!
!
interface Loopback107
 ip address 172.16.107.1 255.255.255.255
!
interface FastEthernet0/1
 switchport mode dynamic desirable
!
!
interface FastEthernet0/19
 switchport access vlan 37
 switchport mode access
!
interface FastEthernet0/20
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/21
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/22
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/23
 switchport mode dynamic desirable
 shutdown
!
interface FastEthernet0/24
 switchport mode dynamic desirable
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan37
 ip address 172.16.37.7 255.255.255.0
!
router ospf 1
 log-adjacency-changes
 redistribute connected subnets route-map l107
 network 172.16.37.7 0.0.0.0 area 67
!
ip classless
ip http server
ip http secure-server
!
!
route-map l107 permit 10
 match interface Loopback107
 set metric 100
 set metric-type type-2
 set tag 200
!
!
control-plane
!
!
line con 0
line vty 0 4
 login
line vty 5 15
 login
!
end

amb1s1

Sw1 Spanning Tree

VLAN37
  Spanning tree enabled protocol ieee
  Root ID    Priority    35768
             Address     000b.5fbf.6d00
             Cost        19
             Port        19 (FastEthernet0/19)
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    35768  (priority 32768 sys-id-ext 37)
             Address     0011.21a1.e780
             Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time 300

Interface           Role Sts Cost      Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa0/6               Desg FWD 100       128.6    P2p
Fa0/19              Root FWD 19        128.19   P2p
Fa0/22              Desg FWD 19        128.22   P2p
Fa0/24              Desg FWD 19        128.24   P2p

spanning tree is stable, no changes.

amb1s1

r6 Arp table

Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  172.16.10.6             -   000f.2411.ba71  ARPA   Ethernet1/1.10
Internet  172.16.10.1            25   000c.ceaf.8772  ARPA   Ethernet1/1.10
Internet  172.16.37.7            25   000b.5fbf.6d00  ARPA   Ethernet1/1.37
Internet  172.16.37.6             -   000f.2411.ba71  ARPA   Ethernet1/1.37

networker050184

interface Ethernet1/1.37
 encapsulation dot1Q 3000
 ip address 172.16.37.6 255.255.255.0

Seems as though this should be encapsulated with 37 unless I'm missing something.

amb1s1

networker050184 wrote: »
interface Ethernet1/1.37
 encapsulation dot1Q 3000
 ip address 172.16.37.6 255.255.255.0
Seems as though this should be encapsulated with 37 unless I'm missing something.

Sorry it was a typo, It is 37. I fix the typo

Jackace

networker050184 wrote: »
interface Ethernet1/1.37
 encapsulation dot1Q 3000
 ip address 172.16.37.6 255.255.255.0
Seems as though this should be encapsulated with 37 unless I'm missing something.

Yes based on the configs and the snipets you have posted it doesn't look like you have the encapsulations right or there was some copy/paste issues. You also mention a router 6 in the mix and I see ports on your SW1 that are forwarding traffic on vlan 37, but we don't know how all these devices are connected and their configs.

deth1k

sh int fa0/6 - on the switch
sh int et1/1 - on the router

plz

networker050184

So are you showing us the actual configs or what? Kind of hard to tell whats going on here. Some are showing 3000 some 37.

amb1s1

networker050184 wrote: »

So are you showing us the actual configs or what? Kind of hard to tell whats going on here. Some are showing 3000 some 37.

Yes, I had some changes made when I copy in here. But I fix that.

deth1k

can you please provide interface output from both switch and router?

thanks

amb1s1

deth1k wrote: »

sh int fa0/6 - on the switch
sh int et1/1 - on the router

plz

Sw1

SW1#sh int f0/6
FastEthernet0/6 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0011.21a1.e786 (bia 0011.21a1.e786)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 208/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Mb/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 00:00:51, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:00:16
  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
     12 packets input, 1968 bytes, 0 no buffer
     Received 4 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     4 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 4 multicast, 0 pause input
     0 input packets with dribble condition detected
     19 packets output, 1352 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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

R6#sh int e1/1
Ethernet1/1 is up, line protocol is up
  Hardware is AmdP2, address is 000f.2411.ba71 (bia 000f.2411.ba71)
  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:04, output 00:00:01, 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
     2340 packets input, 286911 bytes, 0 no buffer
     Received 1704 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     3389 packets output, 389197 bytes, 0 underruns
     69 output errors, 0 collisions, 6 interface resets
     13 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     69 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

I see CRC errors. I thought I check that yesterday. I check for a faulty cable, double check the duplex on both. I clear the counter before showing this input.

amb1s1

I change the configuration from been on interface e1/1 to f0/0 on the R6 and it is working. Why would not work on ethernet even if I have all of the interfaces on duplex full and speed 10.

deth1k

remove "speed" statement on the switch and try again, router will auto neg at 10 and i don't think NM-4E can have it's port hard coded to 10Full, just auto/FULL.

amb1s1

deth1k wrote: »

remove "speed" statement on the switch and try again, router will auto neg at 10 and i don't think NM-4E can have it's port hard coded to 10Full, just auto/FULL.

Just did this and it went to 10 and full duplex on both side r6 e1/1 and switch1 f0/6, but still dropping pings and i see crc errors.

R6:

interface Ethernet1/1
 no ip address
 full-duplex
!
interface Ethernet1/1.10
 encapsulation dot1Q 10
 ip address 172.16.10.6 255.255.255.0
 ip ospf hello-interval 5
!
interface Ethernet1/1.37
 encapsulation dot1Q 37
 ip address 172.16.37.6 255.255.255.0

SW1

interface FastEthernet0/6
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10,37
 switchport mode trunk
 switchport nonegotiate
 duplex full
end

interface FastEthernet0/19
 description connection_to_sw3
 switchport access vlan 37
 switchport mode access
 duplex full
end

sh int output on sw1

SW1(config-if)#do sh int f0/6
FastEthernet0/6 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0011.21a1.e786 (bia 0011.21a1.e786)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 226/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Mb/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 00:00:03, output 00:00:00, 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 1000 bits/sec, 1 packets/sec
  5 minute output rate 1000 bits/sec, 2 packets/sec
     1546 packets input, 215723 bytes, 0 no buffer
     Received 432 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     232 input errors, 232 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 425 multicast, 0 pause input
     0 input packets with dribble condition detected
     3231 packets output, 315923 bytes, 0 underruns
     0 output errors, 1 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


SW1(config-if)#do sh int f0/19
FastEthernet0/19 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 0011.21a1.e793 (bia 0011.21a1.e793)
  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 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:05, 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
     1554 packets input, 127638 bytes, 0 no buffer
     Received 1246 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1243 multicast, 0 pause input
     0 input packets with dribble condition detected
     509 packets output, 58747 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

networker050184

The lost carrier counting up seems that it is either a hardware issue (cabling or possibly the port itself) or you maybe a duplex issue perhaps.

What model router is R6?

amb1s1

networker050184 wrote: »

The lost carrier counting up seems that it is either a hardware issue (cabling or possibly the port itself) or you maybe a duplex issue perhaps.

What model router is R6?

I check this article about 802.1q support on 2600. I see that NM-4E is not support it on 12.2. i have 12.4 on this router. I did a search to see if dot1q is support it on 12.4, but could not find any info on that. I never encounter a technology not support it, but still able to type the command.

802.1Q Encapsulation Support on Cisco 2600/3600 Series Routers [Cisco 2600 Series Multiservice Platforms] - Cisco Systems

show version:

Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport

DCD

Try adding " ip ospf hello-interval 5 " to interface Ethernet1/1.37 statment. There may be more to your topology but I don't see a area 0 in your configuration.