[dhcp_relay]:filter out the ipv6 address of dhcp server for dhcp rela… (

#3397)

* [dhcp_relay]:filter out the ipv6 address of dhcp server for dhcp relay(v4) config file.

Signed-off-by: wangshengjun <wangshengjun@asterfusion.com>

dockers/docker-dhcp-relay/docker-dhcp-relay.supervisord.conf.j2

@@ -43,8 +43,16 @@ isc-dhcp-relay-{{ vlan_name }}
 
 
 {# Create a program entry for each DHCP relay agent instance #}
+{% set relay_for_ipv4 = { 'flag': False } %}
 {% for vlan_name in VLAN %}
 {% if VLAN[vlan_name]['dhcp_servers'] %}
+{% for dhcp_server in VLAN[vlan_name]['dhcp_servers'] %}
+{% if dhcp_server | ipv4 %}
+{% set _dummy = relay_for_ipv4.update({'flag': True}) %}
+{% endif %}
+{% endfor %}
+{% if relay_for_ipv4.flag %}
+{% set _dummy = relay_for_ipv4.update({'flag': False}) %}
 [program:isc-dhcp-relay-{{ vlan_name }}]
 {# We treat this VLAN as a downstream interface (-id), as we only want to listen for requests #}
 command=/usr/sbin/dhcrelay -d -m discard -a %%h:%%p %%P --name-alias-map-file /tmp/port-name-alias-map.txt -id {{ vlan_name }}
@@ -58,14 +66,17 @@ command=/usr/sbin/dhcrelay -d -m discard -a %%h:%%p %%P --name-alias-map-file /t
 {% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %}
 {% if prefix | ipv4 %} -iu {{ name }}{% endif -%}
 {% endfor %}
-{% for dhcp_server in VLAN[vlan_name]['dhcp_servers'] %} {{ dhcp_server }}{% endfor %}
+{% for dhcp_server in VLAN[vlan_name]['dhcp_servers'] %}
+{%- if dhcp_server | ipv4 %} {{ dhcp_server }}{% endif -%}
+{% endfor %}
 
 priority=3
 autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
 
+{% endif %}
 {% endif %}
 {% endfor %}
 {% endif %}