How to connect two Cisco Catalyst 2950 over LAN

cisco-catalystnetworking

I'm trying to connect (2) Cisco Catalyst 2950's over each's respective FastEthernet 0/1 ports, but for some reason, they're not communicating. I'm doing this to physically extend my network and add more network ports.

On SwitchA (10.10.10.1) I have:

!
interface Porth-Channel1
 description UPLINK
 switchport mode trunk
 switchport nonegotiate
 flowcontrol send off
end
!
interface FastEthernet0/1
 description ETHERNET-UPLINK
 switchport mode trunk
 channel-group 1 mode active
end

On SwitchB (10.10.10.2) I have:

!
interface Porth-Channel1
 description UPLINK
 switchport mode trunk
 switchport nonegotiate
 flowcontrol send off
end
!
interface FastEthernet0/1
 description ETHERNET-UPLINK
 switchport mode trunk
 channel-group 1 mode active
end

I have the same config set up on an 8-port 2960 (SwitchC), and if I plug FastEthernet 0/1 of SwitchC to SwitchB or SwitchA, it works. But if I plug FastEthernet 0/1 of SwitchB to SwitchA, it doesn't work.

Am I missing something? How do I get it so I can connect 2 Cisco 2950 switches together?

UPDATE 1

On SwitchA:

#show int port-channel 1 trunk

Port        Mode         Encapsulation  Status        Native vlan
Po1         on           802.1q         trunking      1

Port      Vlans allowed on trunk
Po1         1-4094

Port        Vlans allowed and active in management domain
Po1         1-2,5,30,112,115,120

Port        Vlans in spanning tree forwarding state and not pruned
Po1         1-2,5,30,112,115,120

On SwitchB:

#show int port-channel 1 trunk

Port        Mode         Encapsulation  Status        Native vlan
Po1         on           802.1q         trunking      1

Port      Vlans allowed on trunk
Po1         none

Port        Vlans allowed and active in management domain
Po1         none

Port        Vlans in spanning tree forwarding state and not pruned
Po1         none

For SwitchB, I've tried to add all vlans to be allowed, but it doesn't change anything:

#config t
#int port-channel 1
#switchport trunk allowed vlan all

I've also tried:

#switchport trunk allowed vlan 1-4094

But the allowed vlan's doesn't change to what I tell it to. How do I fix this?

UPDATE 2

I ran a show int po1 switchport on both switches:

SwitchA

#show int po1 switchport
Name: Po1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false

Appliance trust: none

SwitchB

#show int po1 switchport
Name: Po1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false

Appliance trust: none

Still no clue as to why show int po1 trunk shows Vlans allowed on trunk: none

Best Answer

Why are you using Port-channel in first place? I don't see that there are any interfaces associated with that Port-channel.

Try adding vlans on Fa0/1.

Switch(config-if)# switchport trunk allowed vlan add 1

Also, do you have auto-MDIX turned on? If not, make sure you use crossover cables or enable auto-MDIX on interface:

Switch(config-if)# mdix auto

Related Solutions

Cisco – Vlans and subinterfaces

Pardon, in your cut and pasted configs, you appear to be describing Gi0/48 - your uplink to your router, but in your question refer specifically to hosts connected to Gi0/18. I'm going to assume you're describing two different ports here. Further, I'm assuming from details in your config statements and question, that vlan 3 is being used for the 192.168.0.80/28 traffic. I'm going to assume that the vlan has already been declared on your 3560. (Check sh vlan)

First of all, your port Gi0/18 should be configured for access mode on vlan 3. Likely, something like this:

interface GigabitEthernet 0/18
switchport access vlan 3
switchport mode access

As far as for other recommendations. Will all/most of your traffic from your IP subnets be to and from the internet. Basically, If you have enough traffic between subnets, it may suit you to have the 3560 act as your internal router and then dedicate your 3825 to be your border router. The problem is that if your router is baring the entire load for all routing, then a packet from one subnet will arrive at your switch, then be forwarded via the dot1q to your trunk on some vlan X, the router then makes a routing decision and sends the same packet back along the dot1q trunk on some new vlan Y now destined for the destination machine. Btw, I'm simply describing the situation of internal traffic to your customers/organization that crosses your different subnets.

Instead, you can configure the 3560 at the, assuming normal conventions, first address of each vlan/subnet. E.g. 192.168.0.81 and enable ip routing. The next step is you create a new subnet specifically for between the router and switch. For convenience, i'd use something completely different, for example, 192.0.2.0/24 is reserved for documentation examples. Configure the router at 192.0.2.1 and the switch at 192.0.2.2. Have the switch use 192.0.2.1 as the default route. Configure the router to reach 192.168.0.0/16 via the switch at 192.0.2.2. If your network is small enough, static routes should be sufficient. No need for OSPF or anything.

Of course, this would be a rather dramatic change; but it has potential for being a large improvement. It all depends on the nature of your traffic.

For reference, cisco lists the Cisco Catalyst 3560G-48TS and Catalyst 3560G-48PS having a 38.7 Mpps forwarding rate and the Cisco 3825 as having 0.35Mpps forwarding rate. Mpps, just in case you don't know, is millions of packets per second.

It's not bandwidth, but it's how many 64 byte packet routing decisions the device can make a second. The length of the packet doesn't affect how long it takes to making a routing decision. So the peak performance in bits/bytes will be somewhere in a range. In terms of bandwidth, it means that 350kpps is 180Mbps w/ 64byte packets and 4.2Gbps w/ 1500 byte packets. Mind you, that's in bits per second, so think of it as 18 Megabytes or 420 Megabytes per second in regular file-size terms.

In theory, this means that your 3560G can route somewhere between 19.8Gbps and 464Gbps or rougly 2GBps and 45GBps.

Actually, looking at those numbers, you most definitely should consider the plan I described above. Dedicate your 3825 to handling, presumably, NAT'd external traffic and let your 3560 handle the rest.

I'm sorry this is so long; I'm bored at work waiting for tapes to finish. Cheers.

How to create multiple VLAN interfaces on a 802.1Q and LACP trunked network connection on Solaris

Wouldn't you just do this to create the VLAN interfaces on aggr1:

ifconfig plumb aggr118001 plumb
ifconfig plumb aggr999001 plumb

I don't have a create-vlan option to dladm. What Solaris version is that?