Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
125
VSP 4000/7200/8000 – Change metric on BEB-1 to a higher value (worst metric) to use
BEB-2 as default switch for all OSPF external routes
Please note the following:
The lowest external metric wins
o
As BEB-1 is setting the external metric for all OSPF routes redistributed into ISIS with a
metric of 200 added, BEB-2 will be selected as it will have the best cost to all OSPF
networks
o
As BEB-1 is advertising all ISIS routes into OSPF with a Type 2 metric of 200, all OSPF
routers will select the router connected to BEB-2 as the preferred router
As alternative to setting the OSPF redistribution metric to 200 on BEB-1, we
could have configured BEB-2 to redistribute ISIS using Type 1 external metric;
OSPF External Type 1 is preferred over Type 2
configure terminal
no ip alternative-route
route-map "reject" 1
no permit
enable
exit
router ospf
as-boundary-router enable
redistribute isis
redistribute isis enable
exit
router isis
accept adv-rtr 0.90.01
accept adv-rtr 0.90.01 route-map "reject"
accept adv-rtr 0.90.01 enable
redistribute ospf
redistribute ospf metric-type external
redistribute ospf enable
exit
isis apply accept
isis apply redistribute ospf
ip ospf apply redistribute isis
configure terminal
no ip alternative-route
route-map "reject" 1
no permit
enable
exit
router ospf
as-boundary-router enable
redistribute isis
redistribute isis metric 200
redistribute isis enable
exit
router isis
accept adv-rtr 0.90.02
accept adv-rtr 0.90.02 route-map "reject"
accept adv-rtr 0.90.02 enable
redistribute ospf
redistribute ospf metric-type external
redistribute ospf metric 200
redistribute ospf enable
exit
isis apply accept
isis apply redistribute ospf
ip ospf apply redistribute isis