BGP

Border Gateway Protocol (BGP) is the de facto standard exterior gateway protocol used to exchange routing information between autonomous systems (AS) on the Internet and in large enterprise networks. It’s a path-vector protocol that makes routing decisions based on network policies, rules, and path attributes rather than just metrics, enabling fine-grained control over traffic flows and routing policies. BGP supports multiple address families including IPv4 unicast, IPv6 unicast, and L2VPN EVPN, making it essential for modern multi-service networks and MPLS VPN deployments.

Diagram

Classes

routing (iosxe.devices.configuration)

Name	Type	Constraint	Mandatory	Default Value
bgp	Class	`[bgp]`	No

bgp (iosxe.devices.configuration.routing)

Name	Type	Constraint	Mandatory
as_number	Integer		Yes
router_id	IP		No
router_id_interface_type	Choice	`Loopback`	No
router_id_interface_id	Any	String or Integer[min: `0`]	No
default_ipv4_unicast	Boolean	`true`, `false`	No
log_neighbor_changes	Boolean	`true`, `false`	No
address_family	Class	`[address_family]`	No
neighbors	List	`[neighbors]`	No
peer_session_templates	List	`[peer_session_templates]`	No

address_family (iosxe.devices.configuration.routing.bgp)

Name	Type	Constraint	Mandatory
ipv4_unicast	Class	`[ipv4_unicast]`	No
ipv6_unicast	Class	`[ipv6_unicast]`	No
l2vpn_evpn	Class	`[l2vpn_evpn]`	No

neighbors (iosxe.devices.configuration.routing.bgp)

Name	Type	Constraint	Mandatory
ip	IP		Yes
remote_as	Integer		No
description	String		No
shutdown	Boolean	`true`, `false`	No
cluster_id	IP		No
disable_connected_check	Boolean	`true`, `false`	No
fall_over_default_enable	Boolean	`true`, `false`	No
fall_over_default_route_map	String		No
fall_over_bfd	Boolean	`true`, `false`	No
fall_over_bfd_multi_hop	Boolean	`true`, `false`	No
fall_over_bfd_single_hop	Boolean	`true`, `false`	No
fall_over_bfd_check_control_plane_failure	Boolean	`true`, `false`	No
fall_over_bfd_strict_mode	Boolean	`true`, `false`	No
fall_over_maximum_metric_route_map	String		No
local_as	Integer		No
local_as_no_prepend	Boolean	`true`, `false`	No
local_as_replace_as	Boolean	`true`, `false`	No
local_as_dual_as	Boolean	`true`, `false`	No
log_neighbor_changes	Boolean	`true`, `false`	No
password_type	Integer	min: `0`, max: `7`	No
password	String		No
peer_group	String		No
timers_keepalive	Integer	min: `0`, max: `3600`	No
timers_holdtime	Integer	min: `0`, max: `3600`	No
timers_minimum_neighbor_holdtime	Integer	min: `0`, max: `3600`	No
ttl_security_hops	Integer	min: `0`, max: `254`	No
update_source_interface_type	Choice	`Loopback`	No
update_source_interface_id	Any	String or Integer[min: `0`]	No
ebgp_multihop	Boolean	`true`, `false`	No
ebgp_multihop_max_hop	Integer	min: `1`, max: `255`	No
inherit_peer_session	String	Regex: `^[a-zA-Z0-9_-]+$`	No

peer_session_templates (iosxe.devices.configuration.routing.bgp)

Name	Type	Constraint	Mandatory
template_name	String	Regex: `^[a-zA-Z0-9_-]+$`	Yes
remote_as	Integer		No
description	String		No
disable_connected_check	Boolean	`true`, `false`	No
ebgp_multihop	Boolean	`true`, `false`	No
ebgp_multihop_max_hop	Integer	min: `1`, max: `255`	No
update_source_interface_type	Choice	`Loopback`	No
update_source_interface_id	Any	String or Integer[min: `0`]	No
inherit_peer_session	String	Regex: `^[a-zA-Z0-9_-]+$`	No

ipv4_unicast (iosxe.devices.configuration.routing.bgp.address_family)

Name	Type	Constraint	Mandatory
aggregate_addresses	List	`[aggregate_addresses]`	No
networks	List	`[networks]`	No
neighbors	List	`[neighbors]`	No
vrfs	List	`[vrfs]`	No
redistribute	Class	`[redistribute]`	No
admin_distances	List	`[admin_distances]`	No
distance_bgp_external	Integer	min: `1`, max: `255`	No
distance_bgp_internal	Integer	min: `1`, max: `255`	No
distance_bgp_local	Integer	min: `1`, max: `255`	No

ipv6_unicast (iosxe.devices.configuration.routing.bgp.address_family)

Name	Type	Constraint	Mandatory
networks	List	`[networks]`	No
vrfs	List	`[vrfs]`	No
neighbors	List	`[neighbors]`	No
redistribute	Class	`[redistribute]`	No

l2vpn_evpn (iosxe.devices.configuration.routing.bgp.address_family)

Name	Type	Constraint	Mandatory
rewrite_evpn_rt_asn	Boolean	`true`, `false`	No
bgp_nexthop_trigger_delay	Integer	min: `0`, max: `100`	No
neighbors	List	`[neighbors]`	No

aggregate_addresses (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory	Default Value
address	IP		Yes
mask	IP		Yes

networks (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory
network	IP		Yes
mask	IP		No
route_map	String		No
backdoor	Boolean	`true`, `false`	No

neighbors (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory
ip	IP		Yes
activate	Boolean	`true`, `false`	No
send_community	Choice	`both`, `extended`, `standard`	No
route_reflector_client	Boolean	`true`, `false`	No
soft_reconfiguration	Choice	`inbound`	No
default_originate	Boolean	`true`, `false`	No
default_originate_route_map	String		No
route_maps	List	`[route_maps]`	No

vrfs (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory
vrf	String		Yes
advertise_l2vpn_evpn	Boolean	`true`, `false`	No
router_id	IP		No
router_id_interface_type	Choice	`Loopback`	No
router_id_interface_id	Any	String or Integer[min: `0`]	No
aggregate_addresses	List	`[aggregate_addresses]`	No
networks	List	`[networks]`	No
neighbors	List	`[neighbors]`	No
redistribute	Class	`[redistribute]`	No
admin_distances	List	`[admin_distances]`	No
distance_bgp_external	Integer	min: `1`, max: `255`	No
distance_bgp_internal	Integer	min: `1`, max: `255`	No
distance_bgp_local	Integer	min: `1`, max: `255`	No

redistribute (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory	Default Value
connected	Boolean	`true`, `false`	No
static	Boolean	`true`, `false`	No

admin_distances (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast)

Name	Type	Constraint	Mandatory
distance	Integer	min: `1`, max: `255`	Yes
source_ip	IP		Yes
wildcard	IP		Yes
acl	String		No

networks (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast)

Name	Type	Constraint	Mandatory
network	IP		Yes
route_map	String		No
backdoor	Boolean	`true`, `false`	No

vrfs (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast)

Name	Type	Constraint	Mandatory
vrf	String		Yes
advertise_l2vpn_evpn	Boolean	`true`, `false`	No
networks	List	`[networks]`	No
redistribute	Class	`[redistribute]`	No

neighbors (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast)

Name	Type	Constraint	Mandatory
ip	IP		Yes
activate	Boolean	`true`, `false`	No
send_community	Choice	`both`, `extended`, `standard`	No
route_reflector_client	Boolean	`true`, `false`	No
soft_reconfiguration	Choice	`inbound`	No
default_originate	Boolean	`true`, `false`	No
default_originate_route_map	String		No

redistribute (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast)

Name	Type	Constraint	Mandatory	Default Value
connected	Boolean	`true`, `false`	No
static	Boolean	`true`, `false`	No

neighbors (iosxe.devices.configuration.routing.bgp.address_family.l2vpn_evpn)

Name	Type	Constraint	Mandatory
ip	IP		Yes
activate	Boolean	`true`, `false`	No
send_community	Choice	`both`, `extended`, `standard`	No
route_reflector_client	Boolean	`true`, `false`	No
soft_reconfiguration	Choice	`inbound`	No

route_maps (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.neighbors)

Name	Type	Constraint	Mandatory	Default Value
direction	Choice	`in`, `out`	Yes
name	String		Yes

aggregate_addresses (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs)

Name	Type	Constraint	Mandatory	Default Value
address	IP		Yes
mask	IP		Yes

networks (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs)

Name	Type	Constraint	Mandatory
network	IP		Yes
mask	IP		No
route_map	String		No
backdoor	Boolean	`true`, `false`	No

neighbors (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs)

Name	Type	Constraint	Mandatory
ip	IP		Yes
remote_as	Integer		Yes
description	String		No
shutdown	Boolean	`true`, `false`	No
cluster_id	IP		No
log_neighbor_changes	Boolean	`true`, `false`	No
password_type	Integer	min: `0`, max: `7`	No
password	String		No
timers_keepalive	Integer	min: `0`, max: `3600`	No
timers_holdtime	Integer	min: `0`, max: `3600`	No
timers_minimum_holdtime	Integer	min: `0`, max: `3600`	No
fall_over_default_route_map	String		No
fall_over_bfd	Boolean	`true`, `false`	No
fall_over_bfd_multi_hop	Boolean	`true`, `false`	No
fall_over_bfd_single_hop	Boolean	`true`, `false`	No
fall_over_bfd_check_control_plane_failure	Boolean	`true`, `false`	No
fall_over_bfd_strict_mode	Boolean	`true`, `false`	No
fall_over_maximum_metric_route_map	String		No
disable_connected_check	Boolean	`true`, `false`	No
ttl_security_hops	Integer	min: `0`, max: `254`	No
local_as	Integer		No
local_as_no_prepend	Boolean	`true`, `false`	No
local_as_replace_as	Boolean	`true`, `false`	No
local_as_dual_as	Boolean	`true`, `false`	No
update_source_interface_type	Choice	`Loopback`	No
update_source_interface_id	Any	String or Integer[min: `0`]	No
activate	Boolean	`true`, `false`	No
send_community	Choice	`both`, `extended`, `standard`	No
route_reflector_client	Boolean	`true`, `false`	No
soft_reconfiguration	Choice	`inbound`	No
default_originate	Boolean	`true`, `false`	No
default_originate_route_map	String		No
route_maps	List	`[route_maps]`	No
ebgp_multihop	Boolean	`true`, `false`	No
ebgp_multihop_max_hop	Integer	min: `1`, max: `255`	No
ha_mode_graceful_restart	Boolean	`true`, `false`	No
next_hop_self	Boolean	`true`, `false`	No
next_hop_self_all	Boolean	`true`, `false`	No
advertisement_interval	Integer	min: `0`, max: `600`	No

redistribute (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs)

Name	Type	Constraint	Mandatory	Default Value
connected	Boolean	`true`, `false`	No
static	Boolean	`true`, `false`	No

admin_distances (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs)

Name	Type	Constraint	Mandatory
distance	Integer	min: `1`, max: `255`	Yes
source_ip	IP		Yes
wildcard	IP		Yes
acl	String		No

networks (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast.vrfs)

Name	Type	Constraint	Mandatory
network	IP		Yes
route_map	String		No
backdoor	Boolean	`true`, `false`	No
evpn	Boolean	`true`, `false`	No

redistribute (iosxe.devices.configuration.routing.bgp.address_family.ipv6_unicast.vrfs)

Name	Type	Constraint	Mandatory	Default Value
connected	Boolean	`true`, `false`	No
static	Boolean	`true`, `false`	No

route_maps (iosxe.devices.configuration.routing.bgp.address_family.ipv4_unicast.vrfs.neighbors)

Name	Type	Constraint	Mandatory	Default Value
direction	Choice	`in`, `out`	Yes
name	String		Yes

Examples

Example 1: The example below shows basic BGP configuration to bring up an IPv4 Unicast Neighbor and includes basic attributes such as Password protected session, aggregate adderesses, redistribution, network advertisement and applying a route-map to the neighbor.

iosxe:
  devices:
    - name: device1
      configuration:
        routing:
          bgp:
            as_number: 65000
            default_ipv4_unicast: true
            log_neighbor_changes: true
            router_id_interface_type: Loopback
            router_id_interface_id: 0
            neighbors:
              - ip: 192.168.1.1
                remote_as: 65001
                password: 045802150C2E1D1C5A
                password_type: 7
            address_family:
              ipv4_unicast:
                redistribute_connected: true
                redistribute_static: true
                aggregate_addresses:
                  - address: 192.168.0.0
                    mask: 255.255.0.0
                  - address: 10.0.0.0
                    mask: 255.255.255.0
                networks:
                  - network: 10.0.0.0
                    mask: 255.255.255.0
                    route_map: RM1
                    backdoor: false
                  - network: 172.16.12.0
                    mask: 255.255.255.0
                  - network: 192.168.12.0
                    route_map: RM2
                    backdoor: true
                  - network: 172.16.19.0
                neighbors:
                  - ip: 192.168.1.1
                    route_maps:
                      - direction: in
                        name: RM3

Example 2: The example below shows basic BGP configuration to bring up an VRF aware IPv4 Unicast Neighbor and includes basic attributes such as Password protected session, aggregate adderesses, redistribution, network advertisement and applying a route-map to the neighbor.

iosxe:
  devices:
    - name: device1
      configuration:
        routing:
          bgp:
            as_number: 65000
            log_neighbor_changes: true
            address_family:
              ipv4_unicast:
                vrfs:
                  - vrf: MY_VRF
                    redistribute_connected: true
                    redistribute_static: false
                    aggregate_addresses:
                      - address: 192.168.17.0
                        mask: 255.255.255.0
                      - address: 192.168.18.0
                        mask: 255.255.255.0
                    networks:
                      - network: 10.0.0.0
                        mask: 255.255.255.0
                        route_map: RM1
                        backdoor: false
                      - network: 172.16.12.0
                        mask: 255.255.255.0
                      - network: 192.168.12.0
                        route_map: RM2
                        backdoor: true
                      - network: 172.16.19.0
                    neighbors:
                      - ip: 192.168.1.1
                        remote_as: 65001
                        description: "REMOTE_ROUTER"
                        shutdown: false
                        log_neighbor_changes: true
                        password_type: 7
                        password: 045802150C2E1D1C5A
                        activate: true
                        send_community: both
                        soft_reconfiguration: inbound
                        route_maps:
                          - direction: in
                            name: RM2

Example 3: The Example below is a full blank data model for IPv4 address-family of BGP - VRF and non-VRF aware.

iosxe:
  devices:
    - name: router1
      configuration:
        routing:
          bgp:
            as_number: 65001
            default_ipv4_unicast: true
            log_neighbor_changes: true
            router_id_interface_type: Loopback
            router_id_interface_id: 100
            neighbors:
              - ip: 10.0.0.1
                remote_as: 65000
                description: "router2"
                shutdown: false
                cluster_id: 2.2.2.2
                version: 4
                disable_connected_check: false
                fall_over_default_enable: false
                fall_over_default_route_map: RM1
                fall_over_bfd_multi_hop: false
                fall_over_bfd_single_hop: false
                fall_over_bfd_check_control_plane_failure: false
                fall_over_bfd_strict_mode: false
                fall_over_maximum_metric_route_map: RM2
                local_as: 65003
                local_as_no_prepend: false
                local_as_replace_as: false
                local_as_dual_as: false
                log_neighbor_changes: true
                password_type: 7
                password: 045802150C2E1D1C5A
                peer_group: PEER1
                timers_keepalive: 60
                timers_holdtime: 180
                timers_minimum_neighbor_holdtime: 30
                ttl_security_hops: 1
                update_source_interface_type: Loopback
                update_source_interface_id: 100
                ebgp_multihop: false
                ebgp_multihop_max_hop: 5
            address_family:
              ipv4_unicast:
                redistribute_connected: true
                redistribute_static: false
                aggregate_addresses:
                  - address: 192.168.0.0
                    mask: 255.255.0.0
                networks:
                  - network: 10.10.10.0
                    mask: 255.255.255.0
                    route_map: RM3
                    backdoor: false
                  - network: 192.168.0.0
                    route_map: RM4
                    backdoor: false
                neighbors:
                  - ip: 10.0.01
                    activate: true
                    send_community: both
                    route_reflector_client: false
                    soft_reconfiguration: inbound
                    default_originate: false
                    default_originate_route_map:
                    route_maps:
                      - direction: in
                        name: RM5
                vrfs:
                  - vrf:
                    redistribute_connected: true
                    redistribute_static: true
                    router_id_interface_type: Loopback
                    router_id_interface_id: 200
                    aggregate_addresses:
                      - address: 172.16.0.0
                        mask: 255.255.0.0
                    networks:
                      - network: 10.10.20.0
                        mask: 255.255.0.0
                        route_map: RM6
                        backdoor: false
                      - network: 192.168.32.0
                        route_map: RM7
                        backdoor: false
                    neighbors:
                      - ip: 20.20.20.1
                        remote_as: 65003
                        description: "router3"
                        shutdown: false
                        cluster_id: 2.2.2.2
                        log_neighbor_changes: true
                        password_type: 7
                        password: 045802150C2E1D1C5A
                        timers_keepalive: 60
                        timers_holdtime: 180
                        timers_minimum_holdtime: 30
                        fall_over_default_route_map: RM8
                        fall_over_bfd_multi_hop: false
                        fall_over_bfd_single_hop: false
                        fall_over_bfd_check_control_plane_failure: false
                        fall_over_bfd_strict_mode: false
                        fall_over_maximum_metric_route_map: RM9
                        disable_connected_check: false
                        ttl_security_hops: 1
                        local_as: 65000
                        local_as_no_prepend: false
                        local_as_replace_as: false
                        local_as_dual_as: false
                        update_source_interface_type: Loopback
                        update_source_interface_id: 200
                        activate: true
                        send_community: both
                        route_reflector_client: false
                        soft_reconfiguration: inbound
                        default_originate: false
                        default_originate_route_map: RM10
                        route_maps:
                          - direction: out
                            name: RM11
                        ebgp_multihop: false
                        ebgp_multihop_max_hop: 5
                        ha_mode_graceful_restart: false
                        next_hop_self: false
                        next_hop_self_all: false
                        advertisement_interval: 60

Example 4: The example below shows BGP IPv6 unicast configuration including network advertisement, redistribution, neighbor activation, and VRF-aware IPv6 networks.

iosxe:
  devices:
    - name: router1
      configuration:
        system:
          ip_routing: true
          ipv6_unicast_routing: true
        vrfs:
          - name: VRF1
            address_family_ipv4:
              enable: true
            address_family_ipv6:
              enable: true
        routing:
          bgp:
            as_number: 65100
            default_ipv4_unicast: false
            log_neighbor_changes: true
            router_id_interface_type: Loopback
            router_id_interface_id: 0
            neighbors:
              - ip: 2001:db8::1
                remote_as: 65200
            address_family:
              ipv6_unicast:
                networks:
                  - network: 2001:db8:1::/64
                    route_map: RM-IPV6
                    backdoor: false
                  - network: 2001:db8:2::/64
                neighbors:
                  - ip: 2001:db8::1
                    activate: true
                    send_community: both
                    route_reflector_client: false
                    soft_reconfiguration: inbound
                redistribute:
                  connected: true
                  static: false
                vrfs:
                  - vrf: VRF1
                    advertise_l2vpn_evpn: true
                    networks:
                      - network: 2001:db8:100::/48
                        evpn: true
                      - network: 2001:db8:200::/48
                        route_map: RM-VRF
                        backdoor: false
                    redistribute:
                      connected: true
                      static: true

Example 5: The example below demonstrates BGP router-ID configuration using direct IP addresses. This method provides an alternative to the interface-based router-ID configuration shown in previous examples. Both methods are supported and can be used based on your network design requirements.

iosxe:
  devices:
    - name: router1
      configuration:
        system:
          ip_routing: true
        vrfs:
          - name: VRF_DIRECT_IP
            route_distinguisher: "65000:100"
            address_family_ipv4:
              enable: true
        routing:
          bgp:
            as_number: 65000
            router_id: 172.16.255.1  # Direct IP router-ID
            default_ipv4_unicast: false
            log_neighbor_changes: true
            neighbors:
              - ip: 10.1.1.2
                remote_as: 65001
                description: "eBGP_Peer"
            address_family:
              ipv4_unicast:
                redistribute_connected: true
                networks:
                  - network: 10.0.0.0
                    mask: 255.255.255.0
                neighbors:
                  - ip: 10.1.1.2
                    activate: true
                    send_community: both

Note on router-ID configuration methods:

Direct IP method (shown in Example 5): Use router_id: <IP address> for explicit router-ID specification
Interface-based method (shown in Examples 1-4): Use router_id_interface_type: Loopback and router_id_interface_id: <number> to derive router-ID from interface IP
Both methods are mutually exclusive - use one or the other, not both on the same device

Example 6: The example below demonstrates BGP L2VPN EVPN advanced configuration attributes for multi-AS EVPN deployments and nexthop tracking optimization. These attributes provide fine-grained control over EVPN routing behavior and route convergence in large-scale EVPN fabrics.

iosxe:
  devices:
    - name: evpn-spine1
      configuration:
        routing:
          bgp:
            as_number: 65000
            router_id: 192.168.255.1
            default_ipv4_unicast: false
            log_neighbor_changes: true
            neighbors:
              - ip: 10.1.1.2
                remote_as: 65000
                description: "EVPN_Leaf1"
                update_source_interface_type: Loopback
                update_source_interface_id: 0
              - ip: 10.1.1.3
                remote_as: 65000
                description: "EVPN_Leaf2"
                update_source_interface_type: Loopback
                update_source_interface_id: 0
            address_family:
              l2vpn_evpn:
                # EVPN Advanced Configuration
                rewrite_evpn_rt_asn: true              # Enable Route Target ASN rewriting for multi-AS EVPN
                bgp_nexthop_trigger_delay: 10          # Set 10-second delay for nexthop tracking updates
                neighbors:
                  - ip: 10.1.1.2
                    activate: true
                    send_community: both
                    route_reflector_client: true
                  - ip: 10.1.1.3
                    activate: true
                    send_community: both
                    route_reflector_client: true

Example 7: BGP Peer-Session Templates and Template Inheritance

This example demonstrates how to use peer-session templates to reduce configuration repetition and implement template-based inheritance for BGP neighbors. Peer-session templates allow you to define common session parameters once and apply them to multiple neighbors, simplifying configuration management in large-scale BGP deployments.

iosxe:
  devices:
    - name: router1
      configuration:
        interfaces:
          loopbacks:
            - id: 5
              ipv4:
                address: 192.168.5.1
                address_mask: 255.255.255.255
            - id: 100
              ipv4:
                address: 192.168.1.100
                address_mask: 255.255.255.255
        routing:
          bgp:
            as_number: 65000
            log_neighbor_changes: true
            # Define peer-session templates with common parameters
            peer_session_templates:
              - template_name: PEER_TEMPLATE_A
                remote_as: 65001
                description: "EBGP Peer Template for AS 65001"
                update_source_interface_type: Loopback
                update_source_interface_id: 5
                disable_connected_check: true
                ebgp_multihop: true
                ebgp_multihop_max_hop: 3
              - template_name: PEER_TEMPLATE_B
                remote_as: 65002
                description: "EBGP Peer Template for AS 65002"
                update_source_interface_type: Loopback
                update_source_interface_id: 100
                ebgp_multihop: true
                ebgp_multihop_max_hop: 2
              # Template-to-template inheritance
              - template_name: PEER_TEMPLATE_C
                description: "Inherits settings from Template A"
                inherit_peer_session: PEER_TEMPLATE_A
            # Neighbors inherit settings from templates
            neighbors:
              - ip: 10.1.1.1
                inherit_peer_session: PEER_TEMPLATE_A
              - ip: 10.2.2.2
                inherit_peer_session: PEER_TEMPLATE_B
              - ip: 10.3.3.3
                description: "Neighbor with custom description"
                inherit_peer_session: PEER_TEMPLATE_C