feat: add strict bind configuration to BGP templates. Enhance BGP template rendering by including 'strict bind on' for both IPv4 and IPv6 templates, improving address binding behavior in Docker and bridge environments.

internal/birdfmt/bgp.go

@@ -43,6 +43,8 @@ func RenderBGPTemplates(opts BGPTemplatesOptions) (string, error) {
 	b.WriteString("    };\n")
 	b.WriteString("    hold time 90;\n")
 	b.WriteString("    keepalive time 30;\n")
+	// Жёсткая привязка к source address (см. пир): полезно в Docker / bridge, иначе listen может уйти на 0.0.0.0.
+	b.WriteString("    strict bind on;\n")
 	b.WriteString("}\n\n")
 	fmt.Fprintf(&b, "template bgp %s {\n", BGPTemplateNameV6)
 	fmt.Fprintf(&b, "    local as %d;\n", opts.LocalASN)
@@ -54,6 +56,7 @@ func RenderBGPTemplates(opts BGPTemplatesOptions) (string, error) {
 	b.WriteString("    };\n")
 	b.WriteString("    hold time 90;\n")
 	b.WriteString("    keepalive time 30;\n")
+	b.WriteString("    strict bind on;\n")
 	b.WriteString("}\n")
 	return b.String(), nil
 }

internal/birdfmt/testdata/scenarios/standard_layout/bird.d/evobgp_bgp_template.conf

@@ -6,6 +6,7 @@ template bgp bgp_template {
     };
     hold time 90;
     keepalive time 30;
+    strict bind on;
 }
 
 template bgp bgp_template_v6 {
@@ -16,4 +17,5 @@ template bgp bgp_template_v6 {
     };
     hold time 90;
     keepalive time 30;
+    strict bind on;
 }