NMBA network by default will not advertise broadcast/multicast networks, so will some tricks to do so. Eigrp by default have split-horrizon capabilities so normally the route will not loops.
for NBMA network i used frame relay, FS1 is multicast and the other pots router using point to point, so i easy for me to figure out the configuration 🙂
in THis labs I use
FS1 as mutipoint / Core
P1R1 and P1R2 as point to point FR
disables split horison only needs on Core Router since multipoint are in this route and it’s centrals which adv pots router to other pots router.
Here is the the configs :
Router FS1
interface Serial1/1.1 multipoint ip address 172.123.123.1 255.255.255.248 !!! split horison need to add for disable split horison so EIGRP will adv to !!!other pots router no ip split-horizon eigrp 1 frame-relay map ip 172.123.123.2 101 broadcast frame-relay map ip 172.123.123.3 102 broadcast
Router P1R1
interface Serial1/0.1 point-to-point ip address 172.123.123.2 255.255.255.248 frame-relay interface-dlci 101
Router P1R2
interface Serial1/0.1 point-to-point ip address 172.123.123.3 255.255.255.248 !!! no need broadcast keyword because it's point to point frame-relay interface-dlci 102
this Is I already Play with EIGRP:
ip proute from P1R2
D 10.10.1.1 [90/2809856] via 172.123.123.1, 00:06:22, Serial1/0.1 D 10.10.1.2 [90/2809856] via 172.123.123.1, 00:06:22, Serial1/0.1 D 10.10.10.2 [90/2297856] via 172.123.123.1, 00:31:44, Serial1/0.1 D 10.10.10.1 [90/2297856] via 172.123.123.1, 00:31:44, Serial1/0.1
EIGRP neigh
0 172.123.123.1 Se1/0.1 128 00:41:28 253 1518 0 15
Interfaces : Lo1 0 0/0 0 0/1 0 0 Lo2 0 0/0 0 0/1 0 0 Se1/0.1 1 0/0 253 0/15 1027 0 Se1/1 0 0/0 0 0/15 107 0 !!!s1/1 are not advertise because i prevented on P1R1 with passive interface !!!see the configs :
passive-interface Serial1/1 network 10.10.1.0 0.0.0.3 network 172.123.123.0 0.0.0.7 network 172.123.124.0 0.0.0.3 no auto-summary !!!now see if I opened the passive interface : IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 172.123.124.2 Se1/1 10 00:00:13 46 276 0 26 0 172.123.123.1 Se1/0.1 166 00:45:49 210 1260 0 15 !!!its now 172.123.124.2 are began adv the network: 10.0.0.0/32 is subnetted, 6 subnets D 10.10.1.1 [90/2297856] via 172.123.124.2, 00:03:16, Serial1/1 D 10.10.1.2 [90/2297856] via 172.123.124.2, 00:03:16, Serial1/1 D 10.10.10.2 [90/2297856] via 172.123.123.1, 00:03:16, Serial1/0.1 D 10.10.10.1 [90/2297856] via 172.123.123.1, 00:03:16, Serial1/0.1 ---------------------------------------------------- IP-EIGRP Topology Table for AS(1)/ID(10.10.2.2) Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply, r - reply Status, s - sia Status P 10.10.1.1/32, 1 successors, FD is 2297856 via 172.123.124.2 (2297856/128256), Serial1/1 P 10.10.2.2/32, 1 successors, FD is 128256 via Connected, Loopback2 P 10.10.1.2/32, 1 successors, FD is 2297856 via 172.123.124.2 (2297856/128256), Serial1/1 P 10.10.2.1/32, 1 successors, FD is 128256 via Connected, Loopback1 P 10.10.10.2/32, 1 successors, FD is 2297856 via 172.123.123.1 (2297856/128256), Serial1/0.1 P 10.10.10.1/32, 1 successors, FD is 2297856 via 172.123.123.1 (2297856/128256), Serial1/0.1 P 172.123.124.0/30, 1 successors, FD is 2169856 via Connected, Serial1/1 P 172.123.123.0/29, 1 successors, FD is 2169856 via Connected, Serial1/0.1
Suryantofang 