EIGRP Configuration Module¶
This configuration module configures EIGRP routing process on Cisco IOS, Cisco IOS-XE and Cisco Nexus-OS.
IPv4 and IPv6
EIGRP AS number
Unnumbered point-to-point interfaces (Cisco IOS/IOS-XE only)
eigrp.as sets the network-wide EIGRP AS number (default: 1)
eigrp.as – per-node EIGRP AS number (default: 1 – inherited from global defaults)
eigrp.passive – Make this link/interface a passive interface regardless of the global passive interface rules (note: cannot be used to make an interface active).
Using Link Roles¶
Link roles are used together with link types to decide whether to include an interface in an EIGRP process, and whether to make an interface passive:
External links (links with role: external) are not included in the IPv4 EIGRP process on Nexus OS, or in the IPv6 EIGRP processes.
External links are configured as passive IPv4 EIGRP interfaces on Cisco IOS/IOS XE.
Links with role set to stub or passive are configured as passive EIGRP interfaces.
Link role could be set by the BGP module – links with devices from different AS numbers attached to them get a role specified in defaults.bgp.ebgp_role parameter. The system default value of that parameter is external, making inter-AS links passive or excluded from the EIGRP process (see above).
Management interfaces are never added to the EIGRP processes on Nexus-OS or to IPv6 EIGRP process on Cisco IOS/IOS-XE. However, as the Cisco IOS/IOS-XE IPv4 EIGRP configuration uses network 0.0.0.0 255.255.255.255 statement, the management interface could become part of an EIGRP process if it’s not in the management VRF. The management interface is made passive to ensure there’s no exchange of EIGRP updates over it.
We want to create a three-router EIGRP network testing IOS, IOS-XE and Nexus OS EIGRP implementation.
All devices run EIGRP:
module: [ eigrp ]
We’ll use EIGRP AS 2:
eigrp: as: 2
We’ll use IPv4 and IPv6 addressing in our lab. IPv6 addresses will be configured on loopback and LAN interfaces, but not on P2P interfaces.
addressing: loopback: ipv4: 172.18.1.0/24 ipv6: 2001:db8:0::/48 lan: ipv4: 172.19.0.0/16 ipv6: 2001:db8:1::/48
The lab has three nodes, each one of them running a different operating system:
nodes: - name: r1 device: iosv - name: r2 device: csr - name: s1 device: nxos
All three devices share a LAN interface. There are two P2P links, and a stub interface connected to each device. The bandwidth of the LAN interface is set to 100 Mbps.
links: - r1: r2: s1: bandwidth: 100000 - r1-r2 - r2-s1 - r1 - r2 - s1
Resulting EIGRP Configurations¶
The above topology generates the following device configurations 1.
R1 (Cisco IOS)¶
router eigrp 2 network 0.0.0.0 255.255.255.255 passive-interface GigabitEthernet0/3 passive-interface GigabitEthernet0/0 ! ipv6 router eigrp 2 passive-interface GigabitEthernet0/3 ! interface Loopback0 ipv6 eigrp 2 ! interface GigabitEthernet0/1 description r1 -> [r2,s1] bandwidth 100000 ipv6 eigrp 2 ! interface GigabitEthernet0/2 description r1 -> r2 ! interface GigabitEthernet0/3 ipv6 eigrp 2 description Stub interface
R2 (Cisco IOS-XE)¶
router eigrp 2 network 0.0.0.0 255.255.255.255 passive-interface GigabitEthernet5 passive-interface GigabitEthernet1 ! ipv6 router eigrp 2 passive-interface GigabitEthernet5 ! interface Loopback0 ipv6 eigrp 2 ! interface GigabitEthernet2 description r2 -> [r1,s1] bandwidth 100000 ipv6 eigrp 2 ! interface GigabitEthernet3 description r2 -> r1 ! interface GigabitEthernet4 description r2 -> s1 ! interface GigabitEthernet5 description Stub interface ipv6 eigrp 2
S1 (Cisco Nexus-OS)¶
feature eigrp ! router eigrp 2 address-family ipv6 unicast ! interface loopback0 ip router eigrp 2 ipv6 router eigrp 2 ! interface Ethernet1/1 description s1 -> [r1,r2] ip router eigrp 2 ipv6 router eigrp 2 bandwidth 100000 ! interface Ethernet1/2 description s1 -> r2 ip router eigrp 2 ! interface Ethernet1/3 description Stub interface ip router eigrp 2 ipv6 router eigrp 2 ip passive-interface eigrp 2 ipv6 passive-interface eigrp 2
Complete network topology:¶
addressing: loopback: ipv4: 172.18.1.0/24 ipv6: 2001:db8:0::/48 lan: ipv4: 172.19.0.0/16 ipv6: 2001:db8:1::/48 module: [ eigrp ] eigrp: as: 2 nodes: - name: r1 device: iosv - name: r2 device: csr - name: s1 device: nxos links: - r1: r2: s1: bandwidth: 100000 - r1-r2 - r2-s1 - r1 - r2 - s1
Interface descriptions and bandwidths are included in device configurations for documentation purposes even though they are not part of the EIGRP configuration template.