Technical

LONAP runs a stable Internet Exchange, because there is a set of regulations that prohibit certain types of traffic. The example configurations on this page can be used to configure your peering router interfaces, in order to prevent the prohibited traffic reaching the exchange. We recommend that you base your configurations on the example on this page. If you wish to share your configuration for a router that is not described on this page, then please send it to support-at-lonap-dot-net.

It is important to stress that these configurations are sample configurations and you should ensure that the recommendations will fit with your topology. Changes to router software and new protocols released in time may require these recommendations to alter.

Cisco Router, directly connected to the exchange

Connecting your router directly to the exchange is the recommended configuration. This configuration is for members who connect to LONAP and take a 'single VLAN' (access) port. This is the default port style, and the port you will be assigned unless you specifically ask for a multiple VLAN port.

interface GigabitEthernet x/y
        ip address 5.57.80.x 255.255.252.0
        description PEERING:: LONAP Internet Exchange
        no ip redirects
        no ip proxy-arp
        no ip directed-broadcast
        ipv6 address 2001:7f8:17::xxxx:1/64
        ipv6 enable
        ipv6 nd prefix default no-advertise
        ipv6 nd ra suppress
        no mop enable
        no cdp enable
        no keepalive

Cisco Router, connected via intermediate Cisco Switch

This configuration effectively extends the number of ports on your router using 802.1q VLAN trunking. It is not the recommended configuration style, because this method can cause frames to leak from any intermediate switch towards the exchange.

There is a wide variety of switches that can act as intermediate switches. This configuration assumes your switch runs IOS. If a command in this sample configuration is not accepted by your switch, you can check to see whether the feature is available on your equipment - if not then there is no need to explicitly disable the configuration.

interface GigabitEthernet x/y
        description Port facing LONAP Internet Exchange
        switchport access vlan 300
        switchport mode access
        switchport nonegotiate
        no keepalive
        no cdp enable
        no lldp receive
        no lldp transmit
        no udld enable
        spanning-tree bpdufilter enable
    end

    vlan 300
        name LONAP
    end

    interface GigabitEthernet x/z
        description Port Facing London router xxx
        switchport mode trunk
        switchport trunk allowed vlan 300

interface GigabitEthernet x/y
        description Port facing London Switch yyy
        no ip address

interface GigabitEthernet x/y.300
        description PEERING:: LONAP Internet Exchange
        encapsulation dot1q 300
        ip address 5.57.80.x 255.255.252.0
        no ip redirects
        no ip proxy-arp
        no ip directed-broadcast
        ipv6 address 2001:7f8:17::xxxx:1/64
        ipv6 enable
        ipv6 nd prefix default no-advertise
        ipv6 nd ra suppress
        no cdp enable
        no mop enable
        no keepalive

Juniper Router connected to exchange

JUNOS has mostly sensible default interface configuration.

JUNOS' default ARP cache timeout is 20 minutes. As MAC addresses change relatively infrequently on the peering LAN, we recommend increasing this timeout to reduce unnecessary broadcasts.

The ARP aging timer can be configured globally, and/or for each logical interface of family type inet.

To configure the ARP aging timer at the logical interface level, specify the aging-timer statement and the timer value in minutes at the [edit system arp interfaces interface-name] hierarchy level.

A setting of 240 minutes is equivalent to Cisco's default:

[edit system arp interfaces interface-name]
aging-timer 240;

See also:

• JUNOS ARP Learning and Aging Options
• How to suppress the IPv6 Router Advertisement with the Neighbor Discovery timers tuned

ge-0/0/x {
        unit 0 {
            description "PEERING:: LONAP";
            family inet {
                no-redirects
                address 5.57.80.x/22;
            }
            family inet6 {
                address 2001:7F8:17::xxxx:1/64;
            }
        }
    }

ge-0/0/x {
        vlan-tagging;
        unit 4 {
            description "PEERING:: LONAP";
            vlan-id 4;
            family inet {
                no-redirects
                address 5.57.80.x/22;
            }
            family inet6 {
                address 2001:7F8:17::xxxx:1/64;
            }
        }
    }