10-29-2011 04:05 AM
Hello,
Recently I bought a Cisco SG300-10 switch and I encounter an issue with my trunk connection between my SG300-10 and C3500XL.
To clarify easy I add my schematic layout and configuration settings.
Cisco SG300-10 config
Layer 2 setup
Management VLAN : 254
IPv4 : 172.16.254.164/27
Default VLAN : 254
Port VLAN membership :
Interface Mode Admin VLAN Oper. VLAN LAG comment
GE1 ACCESS 66UP 66UP ISP connection
GE3 ACCESS 253UP 253UP PC D
GE4 ACCESS 254UP 254UP PC C
GE10 TRUNK 66T, 253T, 254T 66T, 253T, 254T trunk to C3500XL
Cisco C3500XL config
interface FastEthernet0/1
description ORANGE to Router
switchport access vlan 252
!
interface FastEthernet0/2
description GREEN to router
switchport access vlan 254
!
interface FastEthernet0/3
description BLUE to router
switchport access vlan 253
!
interface FastEthernet0/4
description RED to router
switchport access vlan 66
!
interface FastEthernet0/5
description GREEN to PC A
switchport access vlan 254
!
interface FastEthernet0/6
description BLUE to PC B
switchport access vlan 253
!
interface FastEthernet0/48
description trunk to SG300
switchport trunk encapsulation dot1q
switchport trunk native vlan 254
switchport trunk allowed vlan 66,253,254
switchport mode trunk
sh vlan br
66 RED Fa0/4
252 ORANGE Fa0/1
253 BLUE Fa0/3,Fa0/6
254 GREEN Fa0/2,Fa0/5
My ISP provides an Ip address for my Router/firewall and this works fine.
The trunk from SG300-10 to C3500XL works but not from C3500XL to SG300-10
On my router I run a DHCP server for VLAN 254 and VLAN 253.
My clients PC A and PC B, connected on the switch C3500XL, gets their IP addresses but for the clients PC C and PC D , connected on the switch SG300-10, not.
I upgraded my firmware for SG300-10 to version 1.1.1.8 but still the same issue.
When I change the setting for GE10 like :
GE10 TRUNK 66T, 253T, 254UP 66T, 253T, 254UP trunk to C3500XL
then the client PC C gets an Ip address but still not the client PC D and it's not possible to link 2 PVIDs on the same port.
Does someone else encounter the same issue?
Or are my settings incorrect?
Kind regards,
Christophe
10-29-2011 08:22 AM
Hello Christophe
For the SG300-10, you will want to have vlan 254 set as UP. This will match the native vlan setting on the C3500. The other vlans should be Tagged. The tunk port has to have one native/untagged vlan and all other vlans should be tagged/allowed.
If you assign PC D a static IP on that subnet, can you ping PC B? If so, then the trunk is working correctly.
I hope this information helps
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