Lab 9-8: IS-IS Flat Backbone Area
IS-IS is currently available only at an early stage as an extension to the Zebra/Quagga package, not as production-grade yet. The configurations in Example 9-26 are provided without the usual accompanying routing table output because of the early development stage of the Zebra isisd. Redistribution is not yet implemented, and neither is passive interfaces or autosummary.
In contrast to Cisco IOS Zebra, isisd does not support ECMP. The clns routing statement on Cisco routers is automatically added by Cisco IOS Software and can be safely removed for plain IP operation (no clns routing).
Note that three static alias names were added to the Cisco IOS configuration for demonstration purposes only. The router tagging DEAD is optional under Cisco IOS Software, but it is mandatory under Zebra isisd right now. The Cisco IOS maximum-paths 6 statement configures ECMP for up to six equal-cost paths.
Example 9-26. Configuring an IS-IS Backbone Area
castor-isisd# sh running-config Current configuration: ! hostname castor-isisd password zebra enable password zebra log file /var/log/isisd.log ! interface ed0 ip router isis DEAD ip address 192.168.7.7/24 interface xl0 interface lp0 interface sl0 interface sl1 interface ds0 interface stf0 interface faith0 interface vlan0 interface vlan1 interface lo0 interface ppp0 interface ppp1 interface vlan8 ! router isis DEAD net 49.0001.1921.6800.7007.00 metric-style wide ! line vty ! end callisto-isisd# sh running-config Current configuration: ! hostname callisto-isisd password zebra enable password zebra log file /var/log/isisd.log ! interface eth0 ip router isis DEAD ip address 192.168.14.1/24 interface lo interface eth1 interface ipsec0 interface ipsec1 interface ipsec2 interface ipsec3 interface eth1:1 ! router isis DEAD net 49.0001.1921.6801.4001.00 metric-style wide ! line vty ! end scar# sh running-config ... clns routing ! interface Loopback0 ip address 192.168.201.2 255.255.255.255 ! interface Ethernet0 ip address 192.168.14.254 255.255.255.0 ip router isis DEAD ip load-sharing per-packet no ip mroute-cache ! interface Ethernet1 ip address 192.168.7.254 255.255.255.0 ip router isis DEAD ip load-sharing per-packet no ip mroute-cache ! router isis DEAD redistribute connected redistribute static ip passive-interface Serial0 passive-interface Serial1 maximum-paths 6 default-information originate net 49.0001.1921.6820.1002.00 metric-style wide log-adjacency-changes ! clns host castor 49.0001.1921.6800.7007.00 clns host callisto 49.0001.1921.6801.4001.00 clns host laurel 49.0001.1921.6820.1002.00 ! ...
