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--- linux [2020/07/14 07:42] – [Cisco Catalyst 2950-48 Configuration] philip
+++ linux [2020/07/14 08:00] (current) – [Cisco Catalyst 2950-48 Configuration] philip
@@ Line 35: / Line 35: @@
 ==== Ubuntu LACP Configuration ====
-This example shows the ''/etc/network/interfaces'' configuration using two ethernet interfaces on a server to be combined to form a LAG, and using LACP.
+This example shows the ''/etc/network/interfaces'' configuration using two ethernet interfaces on a server to be combined to form a LAG, and using LACP. Here I'm using VLAN 3, 5 and 7 on the server, and they are being passed by the LAG from the switch the server is connected to. VLAN 3 is for server management access, whereas VLAN 5 and 7 are passed on to virtual machines within the server.
-==== Cisco Catalyst 2950-48 Configuration ====
+<code>
+source /etc/network/interfaces.d/*
+# The loopback network interface
+auto lo
+iface lo inet loopback
+auto eno1
+iface eno1 inet manual
+        bond-master bond0
+auto eno2
+iface eno2 inet manual
+        bond-master bond0
+auto bond0
+iface bond0 inet manual
+        bond-mode 802.3ad
+        bond-miimon 100
+        bond-lacp-rate 1
+        bond-slaves eno1 eno2
+auto bond0.3
+iface bond0.3 inet manual
+        vlan-raw-device bond0
+auto bond0.5
+iface bond0.5 inet manual
+        vlan-raw-device bond0
+auto bond0.7
+iface bond0.7 inet manual
+        vlan-raw-device bond0
+auto br0
+iface br0 inet static
+        address 192.168.1.2
+        netmask 255.255.255.0
+        gateway 192.168.1.254
+        bridge_ports bond0.3
+        bridge_stp off
+        bridge_fd 0
+auto br1
+iface br1 inet manual
+        bridge_ports bond0.5
+        bridge_stp off
+        bridge_fd 0
+auto br2
+iface br2 inet manual
+        bridge_ports bond0.7
+        bridge_stp off
+        bridge_fd 0
+</code>
+==== Cisco Catalyst 2950G-48 Configuration ====
+Configuration snipped for a Catalyst 2950G-48 running '12.1(22)EA13'. Note that the 2950G-48 needs the ''flowcontrol send off'' command - other switches don't seem to need this.
+For security reasons, I've made the native VLAN on the trunk to be 999, rather than the default VLAN of 1. I strongly recommend never to use VLAN1 for anything.
 <code>
 interface Port-channel2
- description V2 Trunk
+ description Trunk
  switchport trunk native vlan 999
  switchport mode trunk
@@ Line 62: / Line 122: @@
 !
 </code>
+With this configuration, VLAN 999 is the native VLAN (frames sent untagged), and all other VLANs (including 1) are sent tagged.
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