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01-17-2022 01:33 PM
Hi Guys,
I have created a 3x VLANs on C3560. I have configured 'ip routing' and needed interfaces. I have access to the internet and I can try ping hosts in the other vlans, however I get response from them only if I add a route manually on each host - even on def. gateway.
Sample config here:
C3560#sh vlan VLAN Name Status Ports ---- -------------------------------- --------- ------------------------------- 1 default active Fa0/13, Fa0/23, Fa0/24, Gi0/1, Gi0/2 2 VLAN0002 active Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/8, Fa0/9, Fa0/10, Fa0/11, Fa0/12 3 VLAN0003 active Fa0/14, Fa0/15, Fa0/16, Fa0/17, Fa0/18, Fa0/19, Fa0/20, Fa0/21, Fa0/22 1002 fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2 ---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------ 1 enet 100001 1500 - - - - - 0 0 2 enet 100002 1500 - - - - - 0 0 3 enet 100003 1500 - - - - - 0 0 1002 fddi 101002 1500 - - - - - 0 0 1003 tr 101003 1500 - - - - - 0 0 1004 fdnet 101004 1500 - - - ieee - 0 0 1005 trnet 101005 1500 - - - ibm - 0 0 Remote SPAN VLANs ------------------------------------------------------------------------------ Primary Secondary Type Ports ------- --------- ----------------- ------------------------------------------ C3560#
C3560#sh ip int b Interface IP-Address OK? Method Status Protocol Vlan1 192.168.2.1 YES NVRAM up down Vlan2 10.1.2.1 YES NVRAM up down Vlan3 10.1.3.1 YES NVRAM up down Vlan10 10.1.10.1 YES NVRAM down down FastEthernet0/1 192.168.1.50 YES NVRAM up up FastEthernet0/2 unassigned YES unset down down FastEthernet0/3 unassigned YES unset down down FastEthernet0/4 unassigned YES unset down down C3560# C3560#sh route C3560#sh run | in route ip route 0.0.0.0 0.0.0.0 192.168.1.254 C3560#
Don't worry that those interfaces are DOWN as I have nothing connected while I'm writing this post.
Why I can't ping 192.168.1.254 which is my ASA5510 (gateway) unless I add route 192.168.1.0 255.255.255.0 192.168.1.50 (interface on a C3560) on that 5510?
I'm missing something simple, but can't figure out what it is...
Thanks in advance.
Slawek
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01-18-2022 12:49 PM - edited 01-18-2022 01:54 PM
I can't ping the above hosts each other. If you can help find out why is that all should start working I hope.
where is this host connected: 192.168.1.147/24, if the same switch what port?
sugestion for testing
default interface FastEthernet0/1
interface FastEthernet0/1
switchport access vlan 10 no shutdown
!
interface vlan 10
ip address 192.168.1.50 255.255.255.0
no shut
!
interface FastEthernet0/23
switchport access vlan 10
connect host to port 23 and test it

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01-17-2022 01:48 PM
Hello,
post the full running configuration of your 3560 switch. Also:
--> however I get response from them only if I add a route manually on each host - even on def. gateway
does that mean it works only if you add something like 'route add' (on a Windows host) ?
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01-18-2022 06:46 AM
Why I can't ping 192.168.1.254 which is my ASA5510 (gateway) unless I add route 192.168.1.0 255.255.255.0 192.168.1.50 (interface on a C3560) on that 5510?
Pinging from Switch you mean ?
if you add that route on ASA , are you able to Ping back and forth ?
By Default p2p IP should able to ping with out any Route adding, since we do not ASA config we can not comment here.
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01-18-2022 11:56 AM - edited 01-18-2022 12:24 PM
Thanks for your responses.
Let's try again from different angle to be sure that I have not mixed things up.
We are talking about 2x VLANs:
- 192.168.1.0/24
- 10.1.2.0/24
Switch is C3560 with L3 routing enabled:
- Native VLAN IP is: 192.168.1.50/24
- VLAN2 IP is: 10.1.2.1/24
FW is ASA5510 as a default gateway (192.168.1.254).
Hosts are:
Host1 - 192.168.1.147/24 - with def. GW set as 192.168.1.254 (ASA5510)
Host2 - 10.1.2.100/24 with def. GW set as 10.1.2.1 (VLAN2 IP in switch C3560)
I can't ping the above hosts each other. If you can help find out why is that all should start working I hope.
Here's a config from the switch C3560 - I've removed password and usernames:
current configuration : 4796 bytes ! ! No configuration change since last restart ! version 12.2 no service pad service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname C3560 ! boot-start-marker boot-end-marker ! no aaa new-model system mtu routing 1500 ip subnet-zero ip routing ! ! ! password encryption aes ! crypto pki trustpoint TP-self-signed-3587941504 enrollment selfsigned subject-name cn=IOS-Self-Signed-Certificate-3587941504 revocation-check none rsakeypair TP-self-signed-3587941504 ! ! ! ! spanning-tree mode pvst spanning-tree extend system-id ! vlan internal allocation policy ascending ! ! ! interface FastEthernet0/1 no switchport ip address 192.168.1.50 255.255.255.0 ! interface FastEthernet0/2 switchport access vlan 2 switchport mode access ! interface FastEthernet0/3 switchport access vlan 2 switchport mode access ! interface FastEthernet0/4 switchport access vlan 2 switchport mode access ! interface FastEthernet0/5 switchport access vlan 2 switchport mode access ! interface FastEthernet0/6 switchport access vlan 2 switchport mode access ! interface FastEthernet0/7 switchport access vlan 2 switchport mode access ! interface FastEthernet0/8 switchport access vlan 2 switchport mode access ! interface FastEthernet0/9 switchport access vlan 2 switchport mode access ! interface FastEthernet0/10 switchport access vlan 2 switchport mode access ! interface FastEthernet0/11 switchport access vlan 2 switchport mode access ! interface FastEthernet0/12 switchport access vlan 2 switchport mode access interface FastEthernet0/13 switchport trunk encapsulation dot1q switchport mode trunk ! interface FastEthernet0/14 switchport access vlan 3 switchport mode access ! interface FastEthernet0/15 switchport access vlan 3 switchport mode access ! interface FastEthernet0/16 switchport access vlan 3 switchport mode access ! interface FastEthernet0/17 switchport access vlan 3 switchport mode access ! interface FastEthernet0/18 switchport access vlan 3 switchport mode access ! interface FastEthernet0/19 switchport access vlan 3 switchport mode access ! interface FastEthernet0/20 switchport access vlan 3 switchport mode access ! interface FastEthernet0/21 switchport access vlan 3 switchport mode access ! interface FastEthernet0/22 switchport access vlan 3 switchport mode access ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 ip address 192.168.2.1 255.255.255.0 ! interface Vlan2 ip address 10.1.2.1 255.255.255.0 ! interface Vlan3 ip address 10.1.3.1 255.255.255.0 ! switchport access vlan 3 switchport mode access ! interface FastEthernet0/21 switchport access vlan 3 switchport mode access ! interface FastEthernet0/22 switchport access vlan 3 switchport mode access ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 ip address 192.168.2.1 255.255.255.0 ! interface Vlan2 ip address 10.1.2.1 255.255.255.0 ! interface Vlan3 ip address 10.1.3.1 255.255.255.0 ! interface Vlan10 ip address 10.1.10.1 255.255.255.0 ! ip classless ip route 0.0.0.0 0.0.0.0 192.168.1.254 ip http server ip http secure-server ! ! control-plane ! ! line con 0 line vty 0 4 password 7 01203C07411E160E22564B02495052 login local transport input ssh line vty 5 15 password 7 1521310F1E3F3B252B293029435253 login local transport input ssh ! ntp clock-period 36029428 ntp server 192.168.1.100 end
and routing again from the switch:
C3560#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.1.254 to network 0.0.0.0
10.0.0.0/24 is subnetted, 1 subnets
C 10.1.2.0 is directly connected, Vlan2
C 192.168.1.0/24 is directly connected, FastEthernet0/1
S* 0.0.0.0/0 [1/0] via 192.168.1.254
C3560#
So all networks should be routable....
and here is a config from ASA5510:
ASA5510# sh run | in route description PlusNet router route outside 0.0.0.0 0.0.0.0 Gateway 1 route inside-NAT 10.1.2.0 255.255.255.0 192.168.1.50 1 route inside-NAT 192.168.2.0 255.255.255.0 192.168.1.50 1
ASA5510# sh ip address System IP Addresses: Interface Name IP address Subnet mask Method Ethernet0/0 outside 172.16.0.254 255.255.255.0 CONFIG Ethernet0/1 inside-NAT 192.168.1.254 255.255.255.0 CONFIG Ethernet0/2 DMZ unassigned unassigned DHCP Ethernet0/3 Guest 10.10.10.254 255.255.255.0 CONFIG Management0/0 management 192.168.10.1 255.255.255.0 CONFIG Current IP Addresses: Interface Name IP address Subnet mask Method Ethernet0/0 outside 172.16.0.254 255.255.255.0 CONFIG Ethernet0/1 inside-NAT 192.168.1.254 255.255.255.0 CONFIG Ethernet0/2 DMZ unassigned unassigned DHCP Ethernet0/3 Guest 10.10.10.254 255.255.255.0 CONFIG Management0/0 management 192.168.10.1 255.255.255.0 CONFIG ASA5510#
I cannot put the whole config for obvious reasons. On ASA5510 there's no VLANs created.
Any idea what I have done incorrectly? The things is that all hosts can go to the internet but can't ping each other.
Many thanks.
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01-18-2022 12:27 PM
Hello,
this won't work:
--> Host1 - 192.168.1.147/24 - with def. GW set as 192.168.1.254 (ASA5510)
The default gateway for the hosts need to be a Vlan interface in the 192.168.1.0/24 range. What Vlan are your hosts supposed to be in ?
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01-18-2022 12:41 PM
Hi,
HOST1 (192.168.1.147/24) is in the same VLAN as its def. gateway which is 192.168.1.254 (ASA5510).
I even tried to change def GW to 192.168.1.50, but it doesn't work either.
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01-18-2022 12:51 PM
Which Vlan is the host in ? You need to use the IP address of a Vlan interface as the default gateway.
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01-18-2022 12:58 PM
I did - see below please:
Host1 - 192.168.1.147/24 - with def. GW set as 192.168.1.254 (ASA5510) --- for this one I have tried to change def. GW to 192.168.1.50 which the IP address of the switch, but it lost access to the internet immediately and I couldn't ping HOST2 nor 8.8.8.8.
Host2 - 10.1.2.100/24 with def. GW set as 10.1.2.1 (VLAN2 IP in switch C3560)
I can ping any host I want directly from the switch. It must single thing.....
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01-18-2022 01:48 PM
Which port on the switch is the host with IP address 192.168.1.147/24 connected to ?
You need a Vlan interface with an IP address in the 192.168.1.0/24 subnet. That IP address must be the gateway for your host. You cannot use the IP address of FastEthernet0/1.
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01-18-2022 12:49 PM - edited 01-18-2022 01:54 PM
I can't ping the above hosts each other. If you can help find out why is that all should start working I hope.
where is this host connected: 192.168.1.147/24, if the same switch what port?
sugestion for testing
default interface FastEthernet0/1
interface FastEthernet0/1
switchport access vlan 10 no shutdown
!
interface vlan 10
ip address 192.168.1.50 255.255.255.0
no shut
!
interface FastEthernet0/23
switchport access vlan 10
connect host to port 23 and test it
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01-18-2022 02:05 PM
Thanks Both!
I live in UK and it’s late here. I’ll check it tomorrow morning first thing.
I think you may be right with that VLAN for 192.168.1.0 network. Will L3 switching still work?
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01-19-2022 01:42 AM
Amazing! That was it! I totally didn't think that not having any VLAN in 192.168.1.0/24 and no ports added to that VLAN, can cause this problem.
I've learned something today
Many thanks Guys for your help. I appreciate it as you have read a random help request and you have sacrificed your time to help a stranger
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01-19-2022 06:20 AM
nice to know all works as suggested...this is best part of community sharing the knowledge....i live in brit too..
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01-19-2022 01:30 PM - edited 01-19-2022 01:31 PM
One more question. How about L3 switching? Since I have re-configured F0/1 into switchport mode, it is not anymore L3 port as per this document from Cisco:
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swint.html#wpxref48776
What it is then? L2 I think. How switch then works on L3?
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01-19-2022 01:35 PM - edited 01-19-2022 01:38 PM
Port is Layer 2, But VLAN SVI Layer 3 and it has routing enable
show ip route show you if no routing enabled as below :
show ip route
Default gateway is not set
same document give you information as below :
Configuring Layer 3 Interfaces
The switch supports these types of Layer 3 interfaces:
•
SVIs: You should configure SVIs for any VLANs for which you want to route traffic. SVIs are created when you enter a VLAN ID following the interface vlan global configuration command. To delete an SVI, use the no interface vlan global configuration command. You cannot delete interface VLAN 1.
