Route Servers & Port Config

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ROUTE SERVERS (RS)

SGIX operates two Route Servers (RS) in Singapore. Once peered with the RS, there is no need to maintain multiple BGP sessions with other members in the IX. RS provide AS-path, MED, Communities and Next-hop transparency so that peering at SGIX still appear to be directly connected. As a result, members traffic are exchanged directly within SGIX switching fabric without passing through RS.

Please note the following when peering with RS

  1. Remove any private ASN in the prefix announcement.
  2. Remove any IP v4v6 default route in the prefix announcement.
  3. Prefixes stated in RFC 1918 are not allowed
  4. Disable check on first-ASN. This may be applicable to Huawei (“undo check-first-as”) and Cisco equipment (“no bgp enforce-first-as”).
  5. The default BGP v4v6 max-prefix threshold is set to 100 but member can request for a different value during provisioning.

Conditions

  1. Members are advised to peer with both RS for redundancy.
  2. Members can choose to establish or maintain bi-lateral peering arrangement with other members.
  3. Members agree not to hold SGIX responsible for any impact on traffic flow due to policies request configured at RS by other members.

BGP Announcement Filtering
Besides the well-known community like NO_EXPORT and NO_ADVERTISE, members can control their prefixes announcement to other members by tagging them with SGIX BGP communities. By default, RS will advertised all prefixes to all peers.
The following table shows SGIX BGP communities in top-down evaluation order. These communities are processed by RS and not propagated to any peers.

0:55518 Block announcement of prefixes to all ASN
0:ASN Block announcement of prefixes to this ASN only
55518:ASN Announce prefixes to this ASN only

For members having 4-byte ASN, they will be mapped to private ASNs. Hence, prefixes announcement manipulation is still possible using above communities.

Connecting using a Routed Port

Connecting to SGIX using a routed port is the preferred design and below is the recommended port configuration (Cisco IOS). Member need to adapt this configuration to their respective platform when connecting to SGIX fabric.

GigabitEthernet X/X/X
  description Facing SGIX Port
  ip address <your_allocated_ipv4_address>
  ipv6 address <your_allocated_ipv6_address> 
  no cdp enable
  no mop enable
  no ip mask-reply
  no ip proxy-arp
  no ip redirects
  no ip directed-broadcast
  no ip unreachables
  no keepalive
  no lldp transmit
  no lldp receive
  no udld enable
  ipv6 nd ra suppress all
  ipv6 nd prefix default no-advertise

Connecting via an Intermediate Switch

The intermediate switch connecting both the customer router and SGIX MUST have a dedicated vlan with no other additional devices in that vlan. SGIX only allow two MAC addresses per port. Below is the recommended switch port configuration facing SGIX. If bpdufilter feature is not available in your platform, we recommend that member disable spanning-tree on the dedicated vlan.

vlan XXX
  name SGIX

GigabitEthernet X/X/X
  description Facing SGIX Port
  switchport mode access
  switchport access vlan XXX
  switchport nonegotiate
  spanning-tree bpdufilter enable
  no keepalive
  no cdp enable
  no lldp receive
  no lldp transmit
  no udld enable