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L2-L3 routing

ncnaveen_arasu
Level 1
Level 1

Dear Team,

We have two routers A & B. We need to terminate 10Mbps link between these two routers. We have got ether output on both the ends.

So at A we have Fast ethernet port for which we can terminate the link.

At B end We does not have Free ethernet port. So we have terminated the WAN link to Core switch gig ehetnet port and configured VLAN which was given by ISP. so there is a uplink from Router to switch and it is trunk and the vlan 225 is allowed in trunk. But we could not able to ping end to end IP's. We have tried swapping the ports also.

If we bypass the router and switch and directly connects the Laptops with VLAN enabled we could able to ping. So please go through the below configuration and suggest the solution and possible root cause at the earliest.

Ar router A.

A#sh run interface fa0/1

Building configuration...

Current configuration : 73 bytes

!

interface FastEthernet0/1

no ip address

speed auto

full-duplex

end

A#sh run interface fa0/1.1

Building configuration...

Current configuration : 177 bytes

!

interface FastEthernet0/1.1

encapsulation dot1Q 225

ip address 10.171.176.106 255.255.255.252

no snmp trap link-status

end

A#sh int fa0/1

FastEthernet0/1 is up, line protocol is up

  Hardware is Gt96k FE, address is 0007.0e7a.aa69 (bia 0007.0e7a.aa69)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 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)

  Full-duplex, 100Mb/s, 100BaseTX/FX

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:19, 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

     4822 packets input, 710305 bytes

     Received 4811 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog

     0 input packets with dribble condition detected

     8602 packets output, 803249 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 output buffer failures, 0 output buffers swapped out

ip route 0.0.0.0 0.0.0.0 10.171.176.105

At end B

In router

Current configuration : 278 bytes

!

interface GigabitEthernet0/1

mtu 1600

no ip address

ip verify unicast reverse-path

no ip redirects

no ip unreachables

no ip proxy-arp

ip pim sparse-mode

ip igmp query-interval 125

media-type rj45

speed 100

duplex full

no negotiation auto

no clns route-cache

end

B#sh run interface gi0/1.6

Building configuration...

Current configuration : 134 bytes

!

interface GigabitEthernet0/1.6

description ATI 10 MB LINK

encapsulation dot1Q 225

ip address 10.171.176.105 255.255.255.252

end

ip route 10.171.179.0 255.255.255.0 10.171.176.106-------------------Reverse route for LAN at end A

In L2 switch

interface GigabitEthernet1/0/21--------------------WAN link  terminated port from end A.

switchport access vlan 225

switchport trunk allowed vlan 225

duplex full

end

L2-MGMT#sh int gigabitEthernet 1/0/21

GigabitEthernet1/0/21 is down, line protocol is down (notconnect)

  Hardware is Gigabit Ethernet, address is 40f4.ec71.7315 (bia 40f4.ec71.7315)

  Description: ATI

  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, Auto-speed, media type is 10/100/1000BaseTX

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 15:46:45, output 15:45:49, 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

     18 packets input, 4780 bytes, 0 no buffer

     Received 18 broadcasts (13 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 13 multicast, 0 pause input

     0 input packets with dribble condition detected

     15365 packets output, 1163615 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

L2-MGMT#sh run interface Gi1/0/24

Building configuration...

Current configuration : 110 bytes

!

interface GigabitEthernet1/0/24

description # ROUTER #

switchport mode trunk

speed 100

duplex full

end


Sh vlan

225  VLAN0225                         active    Gi1/0/21

Please clarify,

Thanks in advance


3 Replies 3

Hi,

I do have almost same kind of scenario and I have done it as attached.

Please rate the helpful tags

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

Rick Morris
Level 6
Level 6

interface GigabitEthernet1/0/21--------------------WAN link  terminated port from end A.

switchport access vlan 225

switchport trunk allowed vlan 225

duplex full

end

Is this a trunk or an access interface?  You need to configure one or the other.  I am assuming this is a trunk so you will need to set the trunk mode and the correct encapsulation.

Good Finding Rick,

I was follwing this post and you apt for the rating

Regards
Thanveer
"Everybody is genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is a stupid."

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