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Routing Problem - 2900XL and 2950 Switches

(Also posted on Cisco Forum)

LAN has Switch A (2900XL) connected to Router. Switch B (2950) is connected to Switch A. Both switches only have VLAN1 and each has its own IP address. Network info: 192.168.2.0/255.255.255.0.

Switch A has server 192.168.2.8 and workstation 192.168.2.226 connected.

Switch B has workstations 192.168.2.13, 192.168.2.229, and printer

192.168.2.232 connected.

Cluster management is not enabled; trunk is not enabled between switches.

Symptoms:

192.168.2.13 can not ping or tracert 192.168.2.232 or 192.168.2.229. Can ping and tracert 192.168.2.8 and 192.168.2.226. 192.168.2.229 can not ping or tracert 192.168.2.232 or 192.168.2.13. Can ping and tracert 192.168.2.8 and 192.168.2.226. 192.168.2.8 can ping and tracert everyone. Switch B can ping everyone but can not trace ip to 192.168.2.232. Switch A can ping everyone but can not trace ip to 192.168.2.232. MAC Address table on Switch B is empty. MAC Address table on Switch A is populated.

This problem didn't used to exist but don't know what changes caused it. Any ideas?

Carl Carpenter IT Manager Hill Country Community MHMR Center

Reply to
ccarpenter
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Carl, wow... interesting.

Please Post the configurations for BOTH switches (minus passwords of course) as well as the output from "show mac-address-table" and "show cdp neighbors"

My first guess is that you've got some kind of port security, private VLAN or subnet mask issue. - But I'll need to see the configs to know for sure.

J.Cottingim

Reply to
jcottingim

Switch A configuration:

------------------ show running-config ------------------

Current configuration: ! ! Last configuration change at 16:09:17 CST Thu Feb 2 2006 ! NVRAM config last updated at 16:04:54 CST Thu Feb 2 2006 ! version 12.0 no service pad service timestamps debug datetime localtime show-timezone service timestamps log datetime localtime show-timezone no service password-encryption ! hostname ScheibMH ! enable secret 5 enable password ! ! ! ! ! clock timezone CST -6 clock summer-time CDT recurring ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 description Video Unit (Falcon) duplex full speed 100 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 description Video Unit (Falcon) ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 description Linda Coleman/2870 ! interface FastEthernet0/22 ! interface FastEthernet0/23 description Scheib MR Switch ! interface FastEthernet0/24 ! interface VLAN1 ip address 192.168.2.2 255.255.255.0 no ip directed-broadcast ip nat outside no ip route-cache ! ip default-gateway 192.168.2.1 snmp-server engineID local 0000000902000002B9B10780 snmp-server community RW snmp-server community RO snmp-server chassis-id 0x0E ! line con 0 transport input none stopbits 1 line vty 0 4 password login line vty 5 15 password login ! ntp clock-period 22517928 ntp server 128.249.1.1 end

Switch B configuration:

------------------ show running-config ------------------

Current configuration : 2208 bytes ! ! Last configuration change at 16:38:55 CST Thu Feb 2 2006 ! NVRAM config last updated at 15:59:41 CST Thu Feb 2 2006 ! version 12.1 no service pad service timestamps debug datetime localtime show-timezone service timestamps log datetime localtime show-timezone no service password-encryption ! hostname ScheibMR ! enable secret 5 ! clock timezone CST -6 clock summer-time CDT recurring ip subnet-zero ! spanning-tree extend system-id ! ! interface FastEthernet0/1 description Community no ip address ! interface FastEthernet0/2 description Bea-II (not used) no ip address ! interface FastEthernet0/3 description Carmilita no ip address ! interface FastEthernet0/4 description Jodie no ip address ! interface FastEthernet0/5 description Nurse no ip address ! interface FastEthernet0/6 description Conference no ip address ! interface FastEthernet0/7 description Laura no ip address ! interface FastEthernet0/8 description Darleen no ip address ! interface FastEthernet0/9 description Printer (4100) no ip address ! interface FastEthernet0/10 description Behavior no ip address ! interface FastEthernet0/11 description Bea-I no ip address ! interface FastEthernet0/12 description Brenda no ip address ! interface FastEthernet0/13 description Printer (4000) no ip address ! interface FastEthernet0/14 description Donna no ip address ! interface FastEthernet0/15 description Michele no ip address ! interface FastEthernet0/16 description Susan no ip address ! interface FastEthernet0/17 no ip address ! interface FastEthernet0/18 no ip address ! interface FastEthernet0/19 no ip address ! interface FastEthernet0/20 no ip address ! interface FastEthernet0/21 no ip address ! interface FastEthernet0/22 no ip address ! interface FastEthernet0/23 no ip address ! interface FastEthernet0/24 description Scheib MH Switch no ip address ! interface Vlan1 ip address 192.168.2.3 255.255.255.0 no ip route-cache ! ip default-gateway 192.168.2.2 ip http server ! snmp-server engineID local 800000090300000AF4FABF01 ! line con 0 line vty 0 4 password login line vty 5 15 password login ! ntp clock-period 17179909 ntp server 128.249.1.1 end

------------------------------------------------------------------------- Switch A MAC address table:

ScheibMH#sh mac-address-table Dynamic Address Count: 28 Secure Address Count: 0 Static Address (User-defined) Count: 0 System Self Address Count: 47 Total MAC addresses: 75 Maximum MAC addresses: 2048 Non-static Address Table: Destination Address Address Type VLAN Destination Port

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

0000.8539.228a Dynamic 1 FastEthernet0/2 0000.8541.15c6 Dynamic 1 FastEthernet0/21 0001.0321.35bb Dynamic 1 FastEthernet0/21 0001.0321.495a Dynamic 1 FastEthernet0/12 0001.0321.531a Dynamic 1 FastEthernet0/9 0001.0321.5b6c Dynamic 1 FastEthernet0/8 0001.0321.5f6c Dynamic 1 FastEthernet0/11 0001.0321.5f6e Dynamic 1 FastEthernet0/14 0001.0321.6ee7 Dynamic 1 FastEthernet0/22 0001.0321.7120 Dynamic 1 FastEthernet0/3 0001.0321.77bc Dynamic 1 FastEthernet0/10 0001.0321.7905 Dynamic 1 FastEthernet0/1 0001.03d6.381d Dynamic 1 FastEthernet0/16 0002.b31e.3729 Dynamic 1 FastEthernet0/4 0003.6b6c.c020 Dynamic 1 FastEthernet0/24 0008.740b.3989 Dynamic 1 FastEthernet0/15 0008.740b.3ba9 Dynamic 1 FastEthernet0/20 0008.740b.3bac Dynamic 1 FastEthernet0/23 0008.740b.3ccb Dynamic 1 FastEthernet0/23 0008.740b.3ebf Dynamic 1 FastEthernet0/23 0008.740b.3ed5 Dynamic 1 FastEthernet0/23 0008.740b.3ed6 Dynamic 1 FastEthernet0/23 0008.740b.3f21 Dynamic 1 FastEthernet0/23 0008.742e.b1df Dynamic 1 FastEthernet0/23 0008.a101.bf8e Dynamic 1 FastEthernet0/7 000a.f4fa.bf18 Dynamic 1 FastEthernet0/23 00d0.090a.8d95 Dynamic 1 FastEthernet0/19 00d0.0932.51bb Dynamic 1 FastEthernet0/6

Switch B MAC Address table:

ScheibMR#sh mac-address-table Mac Address Table

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

Vlan Mac Address Type Ports

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

------------------------------------------------------------------------------------ Switch A CDP Neighbors:

ScheibMH#sh cdp n Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID ScheibMR Fas 0/23 120 S I WS-C2950-2Fas

0/24 Scheib_MHMR Fas 0/24 160 R 2620 Fas 0/0

Switch B CDP Neighbors:

ScheibMR#sh cdp n Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater

Device ID Local Intrfce Holdtme Capability Platform Port ID ScheibMH Fas 0/24 160 T S WS-C2924-XFas

0/23

I have checked the subnet masks on everything (router, DHCP), they're all 255.255.255.0. BTW, I don't know where the ip nat outside entry came from, but I can't delete it.

Reply to
ccarpenter

to remove the "ip nat outside" statement try copying this and pasting it into your switch =========================== clear ip nat translation * configure terminal interface VLAN1 no ip nat outside end ===========================

The ip nat command cannot be removed if there are translations in use. By using the copy and paste method, you can clear the translations then quickly remove it from the switch.

I'm looking at your other issue now.

J.Cottingim

Reply to
jcottingim

ok... I can find no logical reason for switch B to have NO Mac forwarding table.

My suggestion at this point is to capture a "show tech" off of both swithes then power cycle them.

-Let us know if that fixes the problem.

J.Cottingim

Reply to
jcottingim

Rebooting Switch B did the trick. MAC-address-table was instantly populated. Thank you very much.

Reply to
ccarpenter

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