Neighbor Down: Dead timer expired

[CarlosFull]

Hello, first post in this community.

I have recently finished the netacad ccna v7 course and our teacher made us do a final lab with all the knowledge we had acquired which many colleagues did not start it (I have done it as a review of the entire course).

The lab I have done has everything but I have one problem that not been able to solve for 3 days (I´m on the finish !!!).

Let me tell you...

One of the etherchannels, the one that is giving me problems, is made up of 2 switches and a layer 3 switch. The layer 3 is the one that addresses the 3 vlans behind the other two switches. Besides I have enabled 3 interfaces, two that go to two routers towards the rest of the topology (These two routers are connected to each other through a serial connection) and another interface that goes to another router that goes to an ISP formed by a cluster that connect 7 servers, one of each type.

The problem its on one of the interface connected to one of the router that go to the rest of the topology, g1/0/24 with 192.168.210.2 /24. I put the complete error that shows:

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan10 from INIT to DOWN, Neighbor Down: Dead timer expired

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan10 from INIT to DOWN, Neighbor Down: Interface down or detached

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan20 from EXSTART to DOWN, Neighbor Down: Dead timer expired

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan20 from EXSTART to DOWN, Neighbor Down: Interface down or detached

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan30 from INIT to DOWN, Neighbor Down: Dead timer expired

%OSPF-5-ADJCHG: Process 10, Nbr 192.168.210.2 on Vlan30 from INIT to DOWN, Neighbor Down: Interface down or detached

The pings that I send from any pc to one of the servers arrive without problems, those that I send from any of the 6 pcs of those 3 vlans do not, packets are lost...

Something fails me and I don't know what it is. I have checked the config many times and can't find the one.

All routers are through ospf and I think there is the problem but as I say, I do not know what it is. IF I solve it, I will have finished the lab ...

Do you think what could be happening ? I put the run of layer 3 in case you see something at firs sight:

ip dhcp excluded-address 192.168.10.1 192.168.10.10
ip dhcp excluded-address 192.168.20.1 192.168.20.10
ip dhcp excluded-address 192.168.30.1 192.168.30.10
!
ip dhcp pool VLAN10
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
dns-server 192.168.10.10
ip dhcp pool VLAN20
network 192.168.20.0 255.255.255.0
default-router 192.168.20.1
dns-server 192.168.20.10
ip dhcp pool VLAN30
network 192.168.30.0 255.255.255.0
default-router 192.168.30.1
dns-server 192.168.30.10
!
no ip cef
ip routing
!
no ipv6 cef
!
spanning-tree mode rapid-pvst
!
interface Port-channel2
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
!
interface Port-channel3
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
!
interface GigabitEthernet1/0/1
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 2 mode on
!
interface GigabitEthernet1/0/2
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 2 mode on
!
interface GigabitEthernet1/0/3
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 3 mode on
!
interface GigabitEthernet1/0/4
switchport trunk native vlan 99
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
channel-group 3 mode on
!
interface GigabitEthernet1/0/22

description TO_ISP
no switchport
ip address 8.8.8.6 255.255.255.252
duplex auto
speed auto
!
interface GigabitEthernet1/0/23

description TO_R1
no switchport
ip address 192.168.200.2 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet1/0/24

description TO_R2
no switchport
ip address 192.168.210.2 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
!
interface Vlan20
ip address 192.168.20.1 255.255.255.0
!
interface Vlan30
ip address 192.168.30.1 255.255.255.0
!
interface Vlan99
ip address 192.168.99.1 255.255.255.0
!
router ospf 10
log-adjacency-changes
network 8.8.8.4 0.0.0.3 area 0
network 192.168.99.0 0.0.0.255 area 0
network 192.168.200.0 0.0.0.255 area 0
network 192.168.210.0 0.0.0.255 area 0
network 192.168.30.0 0.0.0.255 area 0
network 192.168.20.0 0.0.0.255 area 0
network 192.168.10.0 0.0.0.255 area 0
!
ip default-gateway 8.8.8.5

Thank you very much in advance !!

Regards

[Reza Sharifi]

Hi,

Do you have a diagram for this network? Also, are these real switches and routers or PT?

HTH

[Georg Pauwen]

Hello,

post the zipped Packet Tracer project (.pkt) file...

[CarlosFull]

@reza, pkt...

Enable and console password, cisco...

I send you Georg...

Thanks !!

[Georg Pauwen · Accepted solution]

Hello,

I think I found the problem: there was no Vlan 99 on SW1 and SW2, the SVI was there but it was down/down because Vlan 99 did not exist in the Vlan databases of both switches. I added the Vlan to the databases on both switches, and got end to end connectivity.

Vlan 99 is the native Vlan on the port channel between SW1 and SW2, so without that Vlan being up, the port channel won't work.

Attached the working file. If for some reason the changes were not changed, on SW1 and SW2, just configure this:

SW1#conf t

SW1(config)#vlan 99

SW2#conf t

SW2(config)#vlan 99

[CarlosFull]

Uah, as the performance of the topology has been noticed. Before it was difficult to ping and now it is lighter and faster.

Solved !! Many thanks Georg !!

But while someone was answered, I have reviewed things and I have seen two more problems, one I have solved (dns server, ips in layer 3 wrong) but the other I do not know what happens. It is in the big blue region, the wifi section.

When I set up the Wi-Fi network, there were only 3 APs, the ones I set up, but now there are 6 and the 3 "rare" I can't remove. I don't recognize their mac addresses. Where did those 3 APs come from ???? In fact, I am looking at the pk that I made only with the wifi topology and there are only 3 !!! (Look the attached file...)

A derived problem is that there is a teacher who does not connect to the teachers network despite the Wi-Fi section being well configured. By dhcp IPs it is not because there are for 20 clients. Packet tracer failure ??

[CarlosFull]

Ok, problem solved.

I can't delete the 3 rare APs but at least I have all clients connected.
Thank you very much for the answers and to Georg for for finding the problem and its solution
Regards !!

[Georg Pauwen]

Hello,

is everything solved ? When I open the attached file, I only see three APs...

[CarlosFull]

Hi, physically yes, but if you go (IN THE BIG LAB FILE, in the small lab wifi file are only 3..) to the AP MASTER (https://192.168.220.200 admin > C1sc0h), in the monitor tab, below, you will see 6, and if you go to the wireless tab, you will see 6, the 3 that I created and the other 3, with mac address as name and without ips.

These are the ones that I don't know where they came from (I haven't created them) and that I can't delete either...

You will not know by chance how to delete them ¿? ¿?

Regards

[Georg Pauwen]

I see the WLC2504 AP Master...how do I see what you describe (--> in the monitor tab, below, you will see 6, and if you go to the wireless tab, you will see 6, the 3 that I created and the other 3, with mac address as name and without ips.) ?

Sorry for my questions, you probably know Packet Tracer a lot better than me...

[CarlosFull]

Hi, no, isn´t on packet tracert menu, you have to enter into master ap through the pc that is connected by cable with web browser and the IP that I have given you and the login admin > C1sc0h... Try and see

[Georg Pauwen]

Hello,

I see. I searched for the MAC addresses of these 'rogue' APs but could not find them anywhere in the entire network;

0040.0BCE.5601
0060.2FCC.E601
0001.4384.3B01

What if you set up a blank WLC and connect a management PC ? Possibly these are default APs that are present on any new WLC...

[CarlosFull]

Hello, that's why I created the small wifi lab, to check what was happening. I have the theory that if you create a wifi lab, only the APs that you configure appear, but if you configure a WLC in a network, those 3 appear (I speak in packet tracert, eh?). I've done 2 more wifi labs separately and only 3 come out, the ones you create and configure, so I don't know where they 3 come from !! xDD

If anyone knows what may be happening, welcome! xD

Thank you very much for taking your time Georg

Regards.