EIGRP for IPv6 over Frame Relay

EIGRP for IPv6 (EIGRPv2) over Frame Relay

EIGRP is enabled on per-interface basis using ipv6 eigrp <AS_number> command. However, from the EIGRP router configuration, the router-id is compulsory. Further, by default the EIGRP process is shutdown and hence needs to be enabled manually using no shutdown command from EIGRP router configuration mode.

The following command shows the protocols enabled on the Hub router. It also shows the "K values" used by EIGRP.

Hub# show ipv6 protocols

IPv6 Routing Protocol is "connected"

IPv6 Routing Protocol is "static"

IPv6 Routing Protocol is "eigrp 10"

EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0

EIGRP maximum hopcount 100

EIGRP maximum metric variance 1

Interfaces:

Serial1/0.1

Redistribution:

None

Address Summarization:

CAFE::/126 for Serial1/0.1

Summarizing with metric 2297856

Maximum path: 16

Distance: internal 90 external 170

When the EIGRP process is enabled, it starts to send out Hello messages with multicast address FF02::A (by default, once every 5 seconds on broadcast network and 60 seconds on other networks).

Once EIGRP processes are enabled on Spoke1 and Spoke2 routers, the EIGRP adjacency is established. It can be seen below that EIGRPv2 uses link-local addresses to form neighbor relationship (like OSPFv3).

Hub# debug ipv6 eigrp

*Mar 1 00:41:14.707: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::2 (Serial1/0.1) is up: new adjacency

*Mar 1 00:47:36.967: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::3 (Serial1/0.1) is up: new adjacency

Hub# show ipv6 eigrp neighbors

IPv6-EIGRP neighbors for process 10

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

1 Link-local address: Se1/0.1 160 00:00:19 74 444 0 11

FE80::3

0 Link-local address: Se1/0.1 166 00:06:42 107 642 0 6

FE80::2

Spoke1 and Spoke2 routers only form EIGRP neighbor relationship with Hub router.

Spoke1# show ipv6 eigrp neighbors

IPv6-EIGRP neighbors for process 10

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 Link-local address: Se1/0.201 162 00:16:44 1302 5000 0 13

FE80::1

Spoke2# show ipv6 eigrp neighbors

IPv6-EIGRP neighbors for process 10

H Address Interface Hold Uptime SRTT RTO Q Seq

(sec) (ms) Cnt Num

0 Link-local address: Se1/0.301 170 01:04:12 146 876 0 23

FE80::1

Before summarization, the IPv6 routing table of Spoke1 router shows all individual Loopback prefixes of Spoke2 router.

Spoke1# show ipv6 route

IPv6 Routing Table - 8 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

U - Per-user Static route, M - MIPv6

I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

D - EIGRP, EX - EIGRP external

C 2001::/124 [0/0]

via ::, Serial1/0.201

L 2001::2/128 [0/0]

via ::, Serial1/0.201

D CAFE::1/128 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::2/128 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::3/128 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::4/128 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::5/128 [90/2809856]

via FE80::1, Serial1/0.201

L FF00::/8 [0/0]

via ::, Null0

However, when summary-address is configured on Hub router, the EIGRP adjacency goes down and comes up again.

Hub(config-subif)#ipv6 summary-address eigrp 10 CAFE::/126

Hub(config-subif)#

*Mar 1 01:03:44.071: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::3 (Serial1/0.1) is down: summary configured

*Mar 1 01:03:44.087: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::2 (Serial1/0.1) is down: summary configured

Hub(config-subif)#

*Mar 1 01:04:13.231: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::2 (Serial1/0.1) is up: new adjacency

*Mar 1 01:04:13.395: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::3 (Serial1/0.1) is up: new adjacency

Spoke1#

*Mar 1 01:04:11.383: %DUAL-5-NBRCHANGE: IPv6-EIGRP(0) 10: Neighbor FE80::1 (Serial1/0.201) is up: new adjacency

*Mar 1 01:04:13.331: IPv6-EIGRP(0:10): Processing incoming UPDATE packet

*Mar 1 01:04:13.331: IPv6-EIGRP(0:10): 2001::/124 - do advertise out Serial1/0.201

*Mar 1 01:04:13.331: IPv6-EIGRP(0:10): Int 2001::/124 metric 2169856 - 1657856 512000

*Mar 1 01:04:13.475: IPv6-EIGRP(0:10): Processing incoming UPDATE packet

*Mar 1 01:04:13.475: IPv6-EIGRP(0:10): Int 2001::/124 M 2681856 - 1657856 1024000 SM 2169856 - 1657856 512000

*Mar 1 01:04:13.475: IPv6-EIGRP(0:10): 2001::/124 routing table not updated

*Mar 1 01:04:13.479: IPv6-EIGRP(0:10): 2001::/124 - do advertise out Serial1/0.201

*Mar 1 01:04:13.479: IPv6-EIGRP(0:10): Int 2001::/124 metric 2169856 - 1657856 512000

*Mar 1 01:04:13.675: IPv6-EIGRP(0:10): Processing incoming UPDATE packet

*Mar 1 01:04:13.675: IPv6-EIGRP(0:10): Int 2001::/124 M 2681856 - 1657856 1024000 SM 2169856 - 1657856 512000

*Mar 1 01:04:13.771: IPv6-EIGRP(0:10): Processing incoming UPDATE packet

*Mar 1 01:04:13.775: IPv6-EIGRP(0:10): Int CAFE::4/128 M 2809856 - 1657856 1152000 SM 2297856 - 1657856 640000

*Mar 1 01:04:13.775: IPv6-EIGRP(0:10): CAFE::4/128 (90/2809856) added to RIB

*Mar 1 01:04:13.779: IPv6-EIGRP(0:10): Int CAFE::5/128 M 2809856 - 1657856 1152000 SM 2297856 - 1657856 640000

*Mar 1 01:04:13.779: IPv6-EIGRP(0:10): CAFE::5/128 (90/2809856) added to RIB

*Mar 1 01:04:13.875: IPv6-EIGRP(0:10): Processing incoming UPDATE packet

*Mar 1 01:04:13.879: IPv6-EIGRP(0:10): Int CAFE::/126 M 2809856 - 1657856 1152000 SM 2297856 - 1657856 640000

*Mar 1 01:04:13.879: IPv6-EIGRP(0:10): CAFE::/126 (90/2809856) added to RIB

Spoke1# show ipv6 route

IPv6 Routing Table - 6 entries

Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP

U - Per-user Static route, M - MIPv6

I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary

O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2

D - EIGRP, EX - EIGRP external

C 2001::/124 [0/0]

via ::, Serial1/0.201

L 2001::2/128 [0/0]

via ::, Serial1/0.201

D CAFE::/126 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::4/128 [90/2809856]

via FE80::1, Serial1/0.201

D CAFE::5/128 [90/2809856]

via FE80::1, Serial1/0.201

L FF00::/8 [0/0]

via ::, Null0