Luxembourg:Network

General overview

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Network Architecture

The Luxembourg site is built over two central network components:

• A Core Layer 2 / 3 switch of type Cisco Catalyst 6506E, including one single supervisor (VS-S720-10G) and two line Gigabit copper cards (WS-X6748-GE-TX). This Switch is connecting :
  • the 22 computing Nodes in 1GbE mode to the prod VLAN
  • the 22 computing Nodes in 1GbE mode to the admin VLAN
  • the different frontends and the NFS server (in both prod and admin VLAN)
  • the Renater backbone (VLAN 550)
  • the University of Luxembourg network
• A server farm of type Cisco Nexus 5020, responsible for connecting the 22 computing nodes in 10GbE mode (VLAN hsc)

The global architecture and network organization is based on the Network Golden rules

Connectivity to GRID5000

The connectivity to GRID 5000 is operated by the RESTENA foundation (for the luxembourgian side) in collaboration with Renater. The dedicated Grid5000 line has been prolongated from Nancy toward Luxembourg (see Global network map) via Esch/Elzette.

VLANs

Overview

VLAN	Name	Description	Network
VLAN 10	admin	Administration network (BMC interfaces + eth1 on each server)	172.17.176.0/20
VLAN 30	prod	Production network (all nodes ethernet interfaces + eth0 on each server/virtual machine)	172.16.176.0/20
VLAN 40	UL_DMZprivate	Gateway to the UL internal DMZ	10.74.0.0/16
VLAN 50	hsc	High speed computing network (10GbE)	192.168.14.0/23
VLAN 550	Grid5000	Gateway to Grid5000/Renater 5	192.168.4.0/24
VLAN 1000	BLACKHOLE	local usage, unused ports	n/a

Network routing

VLAN prod: 172.16.176.0/20

• Computing nodes
  • eth0 (1GbE) 172.16.176.0/23
  • eth1 (1GbE) 172.16.178.0/23
• Gateway: 172.16.191.254 (SUP720-10G)
• Servers 172.16.191.0/24
  • phys. eth0 (1GbE) 172.16.191.[1-99]
  • virtual eth0 (1GbE) 172.16.191.[100-99]

VLAN admin: 172.17.176.0/20

• Computing nodes
  • BMC: 172.17.176.0/23
• Gateway: 172.17.191.254 (SUP720-10G)
• Servers 172.17.190.0/23
  • BMC: 172.17.190.0/24
  • phys. eth1 (1GbE) 172.16.191.[1-99]
  • virtual eth1 (1GbE) 172.16.191.[100-99]

VLAN hsc: 192.168.14.0/23

• Computing nodes
  • eth2 (10GbE): 192.168.14.0/23
• Gateway: 192.168.15.254 ( SUP720-10G DHCP Serveur)

The Core Switch (Cisco C6506E) is also acting as a DHCP Server for the Computing Nodes in the hsc VLAN. As the Nexus device is not DHCP Server capable, the hsc VLAN had been extended (using the interface 172.17.191.253 belonging to the admin VLAN on the nexus) to the Core switch which act as DHCP Server. The hsc segment is never routed among the network.

VLAN grid5000: 192.168.4.0/24

• Gateway (Luxembourg) : 192.168.4.21 ( SUP720-10G ), other site gateways: see Renater5

VLAN ext: 10.74.0.0/16

• Connection to the network of the University of Luxembourg
• Gateway 10.74.0.1 (FWSM UNI)