Adding new BGP peer groups PEER_V4_INT and PEER_V6_INT. (#4620)

* Adding new BGP peer groups PEER_V4_INT and PEER_V6_INT. The internal BGP sessions
will be added to this peer group while the external BGP sessions will be added
to the exising PEER_V4 and PEER_V6 peer group.

* Check for "ASIC" keyword in the hostname to identify the internal neighbors.

dockers/docker-fpm-frr/frr/bgpd/templates/general/instance.conf.j2

@@ -15,13 +15,21 @@
 !
 {% if neighbor_addr | ipv4 %}
   address-family ipv4
+{% if 'ASIC' in bgp_session['name'] %}
+    neighbor {{ neighbor_addr }} peer-group PEER_V4_INT
+{% else %}
     neighbor {{ neighbor_addr }} peer-group PEER_V4
+{%   endif %}
 {%   if CONFIG_DB__DEVICE_METADATA['localhost']['sub_role'] == 'BackEnd' %}
     neighbor {{ neighbor_addr }} route-map FROM_BGP_PEER_V4_INT in
 {%   endif %}
 {% elif neighbor_addr | ipv6 %}
   address-family ipv6
+{% if 'ASIC' in bgp_session['name'] %}
+    neighbor {{ neighbor_addr }} peer-group PEER_V6_INT
+{% else %}
     neighbor {{ neighbor_addr }} peer-group PEER_V6
+{%   endif %}
 {%   if CONFIG_DB__DEVICE_METADATA['localhost']['sub_role'] == 'BackEnd' %}
     neighbor {{ neighbor_addr }} route-map FROM_BGP_PEER_V6_INT in
 {%   endif %}

dockers/docker-fpm-frr/frr/bgpd/templates/general/peer-group.conf.j2

@@ -2,28 +2,38 @@
 ! template: bgpd/templates/general/peer-group.conf.j2
 !
   neighbor PEER_V4 peer-group
+  neighbor PEER_V4_INT peer-group
   neighbor PEER_V6 peer-group
+  neighbor PEER_V6_INT peer-group
   address-family ipv4
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['type'] == 'ToRRouter' %}
     neighbor PEER_V4 allowas-in 1
+    neighbor PEER_V4_INT allowas-in 1
 {% endif %}
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['sub_role'] == 'BackEnd' %}
-    neighbor PEER_V4 route-reflector-client
+    neighbor PEER_V4_INT route-reflector-client
 {% endif %}
     neighbor PEER_V4 soft-reconfiguration inbound
     neighbor PEER_V4 route-map FROM_BGP_PEER_V4 in
     neighbor PEER_V4 route-map TO_BGP_PEER_V4 out
+    neighbor PEER_V4_INT soft-reconfiguration inbound
+    neighbor PEER_V4_INT route-map FROM_BGP_PEER_V4 in
+    neighbor PEER_V4_INT route-map TO_BGP_PEER_V4 out
   exit-address-family
   address-family ipv6
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['type'] == 'ToRRouter' %}
     neighbor PEER_V6 allowas-in 1
+    neighbor PEER_V6_INT allowas-in 1
   {% endif %}
 {% if CONFIG_DB__DEVICE_METADATA['localhost']['sub_role'] == 'BackEnd' %}
-    neighbor PEER_V6 route-reflector-client
+    neighbor PEER_V6_INT route-reflector-client
 {% endif %}
     neighbor PEER_V6 soft-reconfiguration inbound
     neighbor PEER_V6 route-map FROM_BGP_PEER_V6 in
     neighbor PEER_V6 route-map TO_BGP_PEER_V6 out
+    neighbor PEER_V6_INT soft-reconfiguration inbound
+    neighbor PEER_V6_INT route-map FROM_BGP_PEER_V6 in
+    neighbor PEER_V6_INT route-map TO_BGP_PEER_V6 out
   exit-address-family
 !
 ! end of template: bgpd/templates/general/peer-group.conf.j2