Inter-Site Igp Routing Design; Figure 4: Grt Igp Vlan Running Ospf And Full Mesh Of Ibgp Peerings - Avaya 8600 Technical Configuration Manual

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As part of best design guidelines, Vlan-id 1 (the default vlan) should never be used

1.3.3 Inter-Site IGP Routing design

IBGP peering
Site1
Site4

Figure 4: GRT IGP VLAN running OSPF and full mesh of IBGP peerings

L3 IGP connectivity between all 5 Sites will be provided via a couple of routed VLANs where an OSPF
backbone area is enabled on all 5 ERS 8600s. This routing instance will constitute the default routing
instance of the ERS 8600 platform which is know as the Global Routing Table (GRT) or VRF0. The
purpose of this routed GRT routing instance is purely to provide IP connectivity between a number of
Circuitless IP (CLIP) interfaces which need to be created on each ERS 8600 as follows.
Each ERS 8600 will be configured with a Circuitless IP address (CLIP) host address using a 32-bit mask.
From these CLIP interfaces a full mesh of IBGP peerings will be configured between each ERS 8600 in
Network Design Implementation to Provide L2 & L3 VPN Connectivity
November 2010
IST MLT
OSPF Routed Core
BGP AS 65000
between Sites using SMLT and IPVPN-Lite for ERS 8600
Technical Configuration Guide
Site3
Site2
Site5
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