Does it need to be a trunk

jaime.mendoza11 · ‎04-20-2017

I have 2 routers I am trying to connect through Wirless link (7609-FO-copper-Wirless-copper-2651XM) the interfaces in both sides are up/up but they can't "see" each other through cdp nor route packets. the obvious suspect was the wirles link (pair of ubiquiti Nano beams tested ok with a switches) but they use WDS (transparent bridging). the routers are managed from the tech staff at the main office and swear they are properly configured. ¿what could be wrong?

Jon Marshall · ‎04-20-2017

Any number of things could be wrong but it is impossible to say with the details you have provided.

How are the ports on the two devices configured, are they in the same IP subnet, what does the arp table on each device show when you try to ping etc etc.

If you can rule out any misconfiguration on the two routers then it must be the wireless.

Jon

jaime.mendoza11 · ‎04-20-2017

First i'd start saying I'm more of a switching guy than routing. A general question before configurations, is CDP protocol independent of vlans? Would a misconfigured vlan prevent the router from receiving cdp packets?

There is a working link via the serial interface in the 2611 and fa1/1 is the port to the local access switch, I'm trying to set up the new link via the fa0/0 interface.

the interfaces config is as follows:

7609 Side: (I marked with ... where I deleted irrelevant lines)
7609>Show int g8/22
GigabitEthernet8/22 is up, line protocol is up (connected)
Hardware is C7600 1Gb 802.3, address is 001f.cae7.0e61 (bia 001f.cae7.0e61)
Description: DUCTS
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Full-duplex, 1000Mb/s, media type is FXMM
...
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec

7609>show int vlan 2107
Vlan2107 is up, line protocol is up
Hardware is EtherSVI, address is 001e.f741.c580 (bia 001e.f741.c580)
Description: DUCTS
Internet address is 172.16.52.85/30
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
...
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec

7609>show int g8/22 switchport
Name: Gi8/22
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
....
Operational private-vlan: none
Trunking VLANs Enabled: 2107
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

2611XM Side:

2611>show int f0/0.2107
FastEthernet0/0.2107 is up, line protocol is up
Hardware is AmdFE, address is 000e.836e.c5a0 (bia 000e.836e.c5a0)
Internet address is 172.16.52.86/30
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 2107.
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters never
2611>show vlans
Virtual LAN ID: 1 (IEEE 802.1Q Encapsulation)
   vLAN Trunk Interfaces: FastEthernet0/0
FastEthernet0/1.1
This is configured as native Vlan for the following interface(s) :
FastEthernet0/0
FastEthernet0/1
...
Virtual LAN ID: 2107 (IEEE 802.1Q Encapsulation)
   vLAN Trunk Interface:   FastEthernet0/0.2107
   Protocols Configured:   Address:              Received:        Transmitted:
           IP              172.16.52.86                 0                  10
2611>show vlan-switch

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active
301 CIR                              active
511 DUCTS               active
1002 fddi-default                     active
1003 token-ring-default               active
1004 fddinet-default                  active
1005 trnet-default                    active

VLAN Type SAID       MTU   Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet 100001     1500 -      -      -        -    -        1002   1003
301 enet 100301     1500 -      -      -        -    -        0      0
511 enet 100511     1500 -      -      -        -    -        0      0
1002 fddi 101002     1500 -      -      -        -    -        1      1003
1003 tr    101003     1500 1005   0      -        -    srb      1      1002
1004 fdnet 101004     1500 -      -      1        ibm -        0      0
1005 trnet 101005     1500 -      -      1        ibm -        0      0

*********

7609 IP=172.16.52.85

2611 IP=172.16.52.86

pinging from either side to the other is unsuccesful, pinging the 2611 to its own addres .86 is successful, pinging 7609 to its own addres .85 is unsuccesful.

I find odd that at the 2611 "show vlans" shows vlan 2107 & "show vlan-switch" does not

Thanks.

Jon Marshall · ‎04-21-2017

Does it need to be a trunk link ie. are you passing other vlans across that link as well ?

If not why not simply make the ports routed ports at both ends ?

Jon

jaime.mendoza11 · ‎04-21-2017

Yes, there are 3 Vlans passing tru.

Jon Marshall · ‎04-21-2017

Sorry to keep going on about this but why route the vlans on the router when it would be far more efficient to route them on the 7600 ?

Anyway that aside the 7600 should be able to ping it's own IP address so I would start looking there first.

Jon

jaime.mendoza11 · ‎04-21-2017

Yeah, I found that odd too. omg I'll have to talk to the main office, they kind of hate when I imply they are in any way wrong :/

I'll post any findings.

Wirless link 2651XM-7609