Solved: Re: Cisco Catalyst 3560-CX Series PD VLAN Setup not working

bob0198labops · ‎10-28-2024

Goal: Create 2 VLANs on a switch (for now, will expand to 4 - have 8 ports on the switch) for a test lab, not for production. Connect devices on these ports (direct connection) and #1. verify ping to VLAN IP, and other devices, and #2. verify ability to talk between devices on the same VLAN, and #3. verify ability to talk between devices on different VLANs. This switch will never connect to a router for Internet access, it will only act as a L3 Switch for a relatively small network

Device Info: Cisco Catalyst 3560-CX Series PD Cisco IOS Software Version 15.2(4)E8
show version
License level: ipbase
License Type: Default. No Valid License found

What has been done so far on this switch:

enable
config terminal
hostname no_internet_switch
vlan 10
interface Gi0/1 (and Gi0/2)
switchport mode access
switchport access vlan 10
interface vlan 10
ip address 192.168.10.1 subnet mask 255.255.255.0

<< Repeated the same seps for VLAN 20, with Gi0/3 and Gi0/4) >>

ip routing

show vlan
1 default active Gi0/3, Gi0/4, Gi0/5, Gi0/6, Gi0/7, Gi0/8
10 vlan1 active Gi0/1, Gi0/2
20 vlan2 active Gi0/3, Gi0/4

show ip route
Gateway of last resort is not set
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, Vlan 10
L 192.168.10.1/32 is directly connected, Vlan 10
C 192.168.20.0/24 is directly connected, Vlan 20
L 192.168.20.1/32 is directly connected, Vlan 20

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 Yes unset up down
Vlan20 192.168.20.1 Yes unset up down

Here is the problem:

When I got the switch, did not check everything, set this up, same VLAN ping worked. Inter VLAN communications did not work. During the course of debugging, did a factory reset and now nothing works. Can someone please point out whats going on ? I am fairly new to this area, and have seen lots of questions like this here, but none where there is a requirement to not have a Router. I have the Vlan IPs as the default gateway on the Linux devices I have connected on the switch. Any help is greatly appreciated.

Cristian Matei · ‎10-30-2024

Hi,

It all looks good, meaning you have ports Gi0/1, Gi0/2 in VLAN10 and Gi0/3, Gi0/4 in VLAN 20 (except that on STP output for VLAN 20, port Gi0/4 does not show up; did you not paste complete output or have disabled STP on that port via BPDFilter?); assuming hosts connected to these ports have IP addresses from the correct subnet, you should be able to have connectivity between PC's and default gateway which is the switch, while based on routing also between hosts in different VLAN's assuming you'v set the correct gateway IP address (the switch) on the hosts. Not sure what OS are the hosts running, however, try to ping the switch from hosts (the other way around, from switch to hosts may not work as maybe hosts have firewall turned on which filters ICMP packets). Based on the ARP and MAC table, you should at leat be able to ping from host 192.168.10.2 to switch which is 192.168.10.1.

ARP entries on the switch will show up only if there is IP communication between switch and host (if you ping the switch from all hosts, the switch should have all ARP entries); MAC entries will show up on switch only if the hosts sends any kind of traffic for switch to learn the MAC address.

Best,

Cristian.

View solution in original post

Flavio Miranda · ‎10-28-2024

@bob0198labops

In order to route between vlan, you need the command "ip routing", that's it. AS your switch have ipbase license, it is able to accept the command and do the needfull

Factory reset is not reason to stopping working. Can you share the show running-config?

bob0198labops · ‎10-28-2024

Thank you for the response, greatly appreciated. I did run the "ip routing" command. Please see the show running-config output and please see if there are any mistakes in the cisco switch setup.

Building Configuration

Current Configuration
version 15.2
no service pad
no service password-encryption
!
hostname xxxxxx
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
system mtu routing 1500
!
!
!
!
!
ip routing
!
!
!
!
!
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
!
!
!
vlan internal allocation policy ascending
!
!
!
!
!
interface GigabitEthernet0/1
switchport access vlan 10
switchport mode access
!
interface GigabitEthernet0/2
switchport access vlan 10
switchport mode access
!
interface GigabitEthernet0/3
switchport access vlan 20
switchport mode access
!
interface GigabitEthernet0/4
switchport access vlan 20
switchport mode access
!
interface GigabitEthernet0/5
!
interface GigabitEthernet0/6
!
interface GigabitEthernet0/7
!
interface GigabitEthernet0/8
!
interface Vlan1
no ip address
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
!
interface Vlan20
ip address 192.168.20.1 255.255.255.0
!
ip forward-protocol nd
!
ip http server
ip http secure server
!
line con 0
line vty 5 15
!
!

end
-----------
Note about the host Linux PCs am testing with :
The hosts I am testing them with have some bridges setup for QEMU and maybe expecting tags - so if the switch configuration looks good, I can switch start looking for issues on the connected hosts. so far, all I have done on the hosts are these commands
sudo ip addr add 192.168.10.2/255.255.255.0 dev enp0s25 (a static ip in the 10 subnet)
sudo ip route add 0.0.0.0 via 192.168.10.1 --> which is Vlan 10's IP on the switch

Please let me know, thank you so much for the help!

MHM Cisco World · ‎10-28-2024

There is nothing need except

No shut down

Needed under vlan SVI

That all

MHM

bob0198labops · ‎10-29-2024

thanks @MHM Cisco World can you please confirm if this is what you mean ?

#Assign Ports

interface GigabitEthernet0/<x>
no shutdown ?????
switchport mode access
switchport access vlan <vlan id>

or is this what you mean ?

#enable VLAN to VLAN communications
ip routing
no shutdown ?????

MHM Cisco World · ‎10-29-2024

I see this before

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 Yes unset up down
Vlan20 192.168.20.1 Yes unset up down

then you now share below

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 YES manual up up
Vlan20 192.168.20.1 YES manual up up

So the VLAN SVI are both UP not problem

only check if you connect correct PC to correct VLAN, i.e. PC with IP in subnet 192.168.10.x must connect to port assign to vlan 10 and PC with IP in subnet 192.168.20.x must connect to port assign to vlan20

MHM

Flavio Miranda · ‎10-28-2024

Send the commnad of "show ip int br" please

did you create the vlan on the switch with the command

conf t

vlan 10

exit

vlan 20

?

bob0198labops · ‎10-29-2024

@Flavio Miranda here is the output - my apologies for the delay, I do not have remote access to this particular environment makes it hard to respond after evening.

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 YES manual up up
Vlan20 192.168.20.1 YES manual up up
GigabitEthernet0/1 unassigned YES unset up up
GigabitEthernet0/2 unassigned YES unset up up
GigabitEthernet0/3 unassigned YES unset up up
GigabitEthernet0/4 unassigned YES unset up up
GigabitEthernet0/5 unassigned YES unset down down
GigabitEthernet0/6 unassigned YES unset down down
GigabitEthernet0/7 unassigned YES unset down down
GigabitEthernet0/8 unassigned YES unset down down
GigabitEthernet0/9 unassigned YES unset down down
GigabitEthernet0/10 unassigned YES unset down down

For your question#2 this is the notes and sequence I used to create them

Config 1/4
----------
enable
config termninal
hostname <name>
show vlan
vlan <vlan id>

#Assign Ports

interface GigabitEthernet0/<x>
switchport mode access
switchport access vlan <vlan id>

#Assign IPs
interface vlan <vlan id>
ip address <match the subnet ids, start with 1, not zero> <subnet mask 255.255.255.0>

#to check everything
ip interface brief

#enable VLAN to VLAN communications
ip routing

Please let me know if you see something not right

Flavio Miranda · ‎10-29-2024

@bob0198labops dont worry

Something has change since your first post. The vlan were down

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 Yes unset up down
Vlan20 192.168.20.1 Yes unset up down

They are up now

show ip interface brief
Vlan1 unassigned Yes unset up down
Vlan10 192.168.10.1 YES manual up up
Vlan20 192.168.20.1 YES manual up up

Still can not communicate?

bob0198labops · ‎10-29-2024

Yes, I just tried with 3 devices connected none of them are able to ping each other. I tried pinging the Vlan Ips, the other device ips, all come back with "Destination Host Unreachable"

Flavio Miranda · ‎10-29-2024

I might say the problem does not seems to be on the switch any more. If you have interface up, vlans UP and ip routing. there is no reason to not ping.

"The hosts I am testing them with have some bridges setup for QEMU and maybe expecting tags - so if the switch configuration looks good, I can switch start looking for issues on the connected hosts. so far, all I have done on the hosts are these commands
sudo ip addr add 192.168.10.2/255.255.255.0 dev enp0s25 (a static ip in the 10 subnet)
sudo ip route add 0.0.0.0 via 192.168.10.1 --> which is Vlan 10's IP on the switch"

As you are running linux, I think it is a good idea to check firewall on the host.

Eventually, test with windows os to make sure. The switch seems to be fine now to me.

Cristian Matei · ‎10-29-2024

Hi,

Can you ping from the switch to any host in any of the VLAN's? Please provide confirmation. From switch side, provide following outputs: "show vlan brief", "show vlan id 10", "show vlan id 20", "show interfaces trunk", "show ip interface brief", "show spanning-tree vlan 10", "show spanning-tree vlan 20", "show ip route", "show ip cef", "show ip arp", "show mac address-table", "show version".

Best,

Cristian.

bob0198labops · ‎10-29-2024

@Cristian Matei

answer to your first question - No am not able to

from the switch : ping - fails traceroute ip - gives 30 hops all with * * *

please review the outputs below and provide your inputs.

just a dumb question, since I have never used ip cef before or the mac address-table - they both seem to show only one connected host - could this mean the switch is good, something wrong with the connected hosts ?

show vlan brief

1 default active Gi0/5.Gi0/6.Gi0/7.Gi0/8.

Gi0/9.Gi0/10

10 VLAN0010 active Gi0/1.Gi0/2

20 VLAN0020 active Gi0/3.Gi0/4

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

show vlan id 10

VLAN Name Status Ports

---- -------------------------------- --------- ------------------------------

10 VLAN0010 active Gi0/1.Gi0/2

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

10 enet 100010 1500 - - - - - 0 0

Remote SPAN VLANs

------------------------------------------------------------------------------

Disabled

Primary Secondary Type Ports

------- --------- ----------------- ------------------------------------------

show vlan id 20

VLAN Name Status Ports

---- -------------------------------- --------- ------------------------------

20 VLAN0020 active Gi0/3.Gi0/4

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

20 enet 100020 1500 - - - - - 0 0

Remote SPAN VLANs

------------------------------------------------------------------------------

Disabled

Primary Secondary Type Ports

------- --------- ----------------- ------------------------------------------

show interfaces trunk

show ip interface brief

Vlan1 unassigned YES unset up down

Vlan10 192.168.10.1 YES manual up up

Vlan20 192.168.20.1 YES manual up up

GigabitEthernet0/1 unassigned YES unset up up

GigabitEthernet0/2 unassigned YES unset up up

GigabitEthernet0/3 unassigned YES unset up up

GigabitEthernet0/4 unassigned YES unset down down

GigabitEthernet0/5 unassigned YES unset down down

GigabitEthernet0/6 unassigned YES unset down down

GigabitEthernet0/7 unassigned YES unset down down

GigabitEthernet0/8 unassigned YES unset down down

GigabitEthernet0/9 unassigned YES unset down down

GigabitEthernet0/10 unassigned YES unset down down

show spanning-tree vlan 10

Spanning tree enabled protocol rstp

Root ID Priority 32778

Address 308b.b2e2.c380

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)

Address 308b.b2e2.c380

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

—————- —- — ——— ——– ——————————–

Gi0/1 Desg FWD 4 128.1 P2p

Gi0/2 Desg FWD 4 128.2 P2p

show spanning-tree vlan 20

Spanning tree enabled protocol rstp

Root ID Priority 32788

Address 308b.b2e2.c380

This bridge is the root

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)

Address 308b.b2e2.c380

Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

Aging Time 300 sec

Interface Role Sts Cost Prio.Nbr Type

—————- —- — ——— ——– ——————————–

Gi0/3 Desg FWD 4 128.3 P2p

show ip route

192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.10.0/24 is directly connected, Vlan10

L 192.168.10.1/32 is directly connected, Vlan10

192.168.20.0/24 is variably subnetted, 2 subnets, 2 masks

C 192.168.20.0/24 is directly connected, Vlan20

L 192.168.20.1/32 is directly connected, Vlan20

show ip cef

Prefix Next Hop Interface

0.0.0.0/0 no route

0.0.0.0/8 drop

0.0.0.0/32 receive

127.0.0.0/8 drop

192.168.10.0/24 attached Vlan10

192.168.10.0/32 receive Vlan10

192.168.10.1/32 receive Vlan10

192.168.10.2/32 attached Vlan10

192.168.10.255/32 receive Vlan10

192.168.20.0/24 attached Vlan20

192.168.20.0/32 receive Vlan20

192.168.20.1/32 receive Vlan20

192.168.20.255/32 receive Vlan20

224.0.0.0/4 drop

224.0.0.0/24 receive

240.0.0.0/4 drop

255.255.255.255/32 receive

show ip arp

Protocol Address Age(min) Hardware Addr Type Interface

Internet 192.168.10.1 - 308b.b2e2.c3c1 ARPA Vlan10

Internet 192.168.10.2 184 20c5.eb9a.299c ARPA Vlan10

Internet 192.168.20.1 - 308b.b2e2.c3c2 ARPA Vlan20

show mac address-table

Mac Address Table

-------------------------------------------.

Vlan Mac Address Type Ports

---- ----------- -------- -----

All 0100.9297.cccc STATIC CPU

All 0100.9297.cccd STATIC CPU

All 0100.9297.cddc STATIC CPU

All 0180.c200.ef01 STATIC CPU

All 0180.c200.ef02 STATIC CPU

All 0180.c200.ef03 STATIC CPU

All 0180.c200.ef04 STATIC CPU

All 0180.c200.ef05 STATIC CPU

All 0180.c200.ef06 STATIC CPU

All 0180.c200.ef07 STATIC CPU

All 0180.c200.ef08 STATIC CPU

All 0180.c200.ef09 STATIC CPU

All 0180.c200.ef0a STATIC CPU

All 0180.c200.ef0b STATIC CPU

All 0180.c200.ef0c STATIC CPU

All 0180.c200.ef0d STATIC CPU

All 0180.c200.ef0e STATIC CPU

All 0180.c200.ef0f STATIC CPU

All 0180.c200.ef10 STATIC CPU

All ffff.ffff.ffff STATIC CPU

10 20c5.eb9a.299c Dynamic Gi0/2

10 5254.009d.fcfb Dynamic Gi0/2

show version

Cisco IOS Software, C3560CX Software (C3560CX-UNIVERSALK9-M), Version 15.2(4)E8, RELEASE SOFTWARE (fc3)

Technical Support: http://www.cisco.com/techsupport

Compiled Thu 15-Mar-19 12:14 by prod_rel_team

ROM: Bootstrap program is C3560CX boot loader

BOOTLDR: C3560CX Boot Loader (C3560CX-HBOOT-M) Version 15.2(4r)E5, RELEASE SOFTWARE (fc4)

License Level: ipbase

License Type: Default. No valid license found.

Next reload license Level: ipbase

cisco WS-C3560CX-8PT-S (ARM86XXX) processor (revision H0) with 524288K bytes of memory.

Processor board ID FOC1330R1AT

Last reset from power-on

3 Virtual Ethernet interface

10 Gigabit Ethernet interfaces

The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address :xxxx

Motherboard assembly number :xxxx

Motherboard serial number : xxxxxx

Model revision number : H0

Motherboard revision number : C0

Model number : WS-C3560E-48PD-S

System serial number : xxxxx

Top Assembly Part Number : xxxxx

Top Assembly Revision Number : F0

Version ID : V02

CLEI Code Number : xxxxx

Hardware Board Revision Number : 0x09

Switch Ports Model SW Version SW Image

------ ----- ----- ---------- ----------

* 1 10 WS-C3560CX-8PT-S 15.2(4)E8 C3560CX-UNIVERSALK9-M

Configuration register is 0xF

Cristian Matei · ‎10-30-2024

Hi,

It all looks good, meaning you have ports Gi0/1, Gi0/2 in VLAN10 and Gi0/3, Gi0/4 in VLAN 20 (except that on STP output for VLAN 20, port Gi0/4 does not show up; did you not paste complete output or have disabled STP on that port via BPDFilter?); assuming hosts connected to these ports have IP addresses from the correct subnet, you should be able to have connectivity between PC's and default gateway which is the switch, while based on routing also between hosts in different VLAN's assuming you'v set the correct gateway IP address (the switch) on the hosts. Not sure what OS are the hosts running, however, try to ping the switch from hosts (the other way around, from switch to hosts may not work as maybe hosts have firewall turned on which filters ICMP packets). Based on the ARP and MAC table, you should at leat be able to ping from host 192.168.10.2 to switch which is 192.168.10.1.

ARP entries on the switch will show up only if there is IP communication between switch and host (if you ping the switch from all hosts, the switch should have all ARP entries); MAC entries will show up on switch only if the hosts sends any kind of traffic for switch to learn the MAC address.

Best,

Cristian.

bob0198labops · ‎10-30-2024

@Cristian Matei Thank you so much, I believe I am one step closer to the solution at this point. my hosts are linux machines, and had someone make some changes to remove bridges running on both the hosts today, so now

the host connected to VLAN 10 is able to successfully ping the gateway IP - that was not working so far

the host connected to VLAN 20 is NOT able to successfully ping the gateway IP "Destination Host Unreachable" which means there is some issue on the switch. Here are the ONLY differences I saw today, with your list of commands (ran all of them again this morning)

192.168.10.0/24 attached Vlan10
192.168.10.0/32 receive Vlan10
192.168.10.1/32 receive Vlan10
192.168.10.2/32 attached Vlan10
192.168.10.255/32 receive Vlan10
192.168.20.0/24 attached Vlan20
192.168.20.0/32 receive Vlan20
192.168.20.1/32 receive Vlan20
192.168.20.2/32 attached Vlan20 <----- NEW LINE TODAY, AFTER CHANGES TO HOST CONNECTED ON VLAN 20
192.168.20.255/32 receive Vlan20

Protocol Address Age(min) Hardware Addr Type Interface
Internet 192.168.10.1 - 308b.b2e2.c3c1 ARPA Vlan10
Internet 192.168.10.2 44 20c5.eb9a.299c ARPA Vlan10
Internet 192.168.20.1 - 308b.b2e2.c3c2 ARPA Vlan20
Internet 192.168.20.2 47 20c5.eb9a.298d ARPA Vlan20 <----- NEW LINE TODAY, AFTER CHANGES TO HOST CONNECTED ON VLAN 20

Can you please explain "(except that on STP output for VLAN 20, port Gi0/4 does not show up; did you not paste complete output or have disabled STP on that port via BPDFilter?);" I did not have any hosts connected on Gi0/4 - can you explain this in a bit more detail ? One last step before I can 100% declare the Switch is good, mark yours as the right answer (helping with all the commands to make sure I can verify if the config was good). Or any other suggestions on why I would get a "Destination Host Unreachable" for a host on Vlan 20 and not on Vlan 10.

Once again, thanks much !