Merge pull request #3938 from k8s-infra-cherrypick-robot/cherry-pick-…

…3932-to-release-1.27

[release-1.27] [IPv6] backend pool name should be case-insensitive

pkg/provider/azure_standard.go

@@ -59,6 +59,10 @@ const (
 	v6Suffix = "IPv6"
 )
 
+var (
+	v6SuffixLower = strings.ToLower(v6Suffix)
+)
+
 // returns the full identifier of an availabilitySet
 func (az *Cloud) getAvailabilitySetID(resourceGroup, availabilitySetName string) string {
 	return fmt.Sprintf(
@@ -276,7 +280,7 @@ func getBackendPoolName(clusterName string, isIPv6 bool) string {
 
 // ifBackendPoolIPv6 checks if a backend pool is of IPv6 according to name/ID.
 func isBackendPoolIPv6(name string) bool {
-	return strings.HasSuffix(name, fmt.Sprintf("-%s", v6Suffix))
+	return strings.HasSuffix(strings.ToLower(name), fmt.Sprintf("-%s", v6SuffixLower))
 }
 
 func (az *Cloud) getLoadBalancerRuleName(service *v1.Service, protocol v1.Protocol, port int32, isIPv6 bool) string {

pkg/provider/azure_standard_test.go

@@ -936,7 +936,7 @@ func TestIsBackendPoolIPv6(t *testing.T) {
 		{"bp-IPv6", true},
 		{"bp-IPv4", false},
 		{"bp", false},
-		{"bp-ipv6", false},
+		{"bp-ipv6", true},
 	}
 	for _, test := range testcases {
 		isIPv6 := isBackendPoolIPv6(test.name)