Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
147
20.1.28
Fabric Extend over Routed Infrastructure using GRT
to interconnect to routed network
Please note that the preferred method is using a VRF for the core routing as shown in the previous example.
If you use the GRT method as shown below, please ensure you add a route policy to prevent all the core
IP interfaces, local and loopback, from being advertised into ISIS. Please begin by enable IP Shortcuts on
all switches – see section above titled IP Shortcuts.
interface GigabitEthernet 2/4
no shutdown
brouter vlan 15 subnet 10.8.15.2/30
no spanning-tree mstp force-port-state enable
ip ospf enable
exit
router ospf enable
vlan create 15 name "core_vlan15" type port-mstprstp 0
vlan members 15 1/33
interface Vlan 15
ip address 10.8.3.14 255.255.255.252
ip ospf enable
exit
interface GigabitEthernet 1/33
no shutdown
no spanning-tree mstp force-port-state enable
exit
interface loopback 10
ip address 10 10.4.4.41/32
ip ospf 10
exit
router ospf enable
router ospf
router-id 10.4.4.41
exit
Configure Core Networking - GRT
interface GigabitEthernet 1/33
no shutdown
brouter vlan 4 subnet 10.8.3.10/30
no spanning-tree mstp force-port-state enable
ip ospf enable
exit
interface loopback 10
ip address 10 10.4.4.42/32
ip ospf 10
exit
router ospf enable
router ospf
router-id 10.4.4.42
exit