Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
124
configure terminal
route-map deny_ext 1
no permit
match metric-type-isis external
enable
exit
router isis
accept route-map deny_ext
exit
isis apply accept
For route to go into ECMP, both the internal and external metric must be the
same
o
External type routes
Will only consider the external route metric (prefix-cost)
For route to go into ECMP, only the external metric must be the same
External metrics is supported as of release 5.0 for the VSP 4000, VSP 8000, and VSP 7200
o
Only IPv4 routes are supported in this release
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 0.90.02
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 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 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
Please note the followin
g
:
BEB-1 and BEB-2 are configured to redistribute OSPF with external metric type
Only for BEB-5 and BEB-6, an accept policy is created to simply deny all external routes (OSPF
routes) advertised from BEB-1 and BEB-2
o
End result, no external OSPF networks will be added to BEB-5 and BEB-6 route table
BEB-3 and BEB-4 will add the OSPF networks into their respective route tables as ISIS routes
VSP 4000/7200/8000 – Using a Route-Map to deny routes with External Metrics