diff --git a/src/net/freertr/rtr/rtrIsisIface.java b/src/net/freertr/rtr/rtrIsisIface.java
index 4c488ac146..d677a4e203 100644
--- a/src/net/freertr/rtr/rtrIsisIface.java
+++ b/src/net/freertr/rtr/rtrIsisIface.java
@@ -919,7 +919,11 @@ public static void routerGetHelp(userHelping l) {
         l.add(null, "5 .           minimum                 take lowest");
         l.add(null, "5 .           average                 take average");
         l.add(null, "5 .           maximum                 take highest");
-        l.add(null, "5 .           differs                 take differences");
+        l.add(null, "5 .           summary                 take summary");
+        l.add(null, "5 .           dif-min                 take lowest of differences");
+        l.add(null, "5 .           dif-avg                 take average of differences");
+        l.add(null, "5 .           dif-max                 take highest of differences");
+        l.add(null, "5 .           dif-sum                 take summary of differences");
     }
 
     /**
diff --git a/src/net/freertr/rtr/rtrLsrpIface.java b/src/net/freertr/rtr/rtrLsrpIface.java
index db9bc3053e..c5d9f06d33 100644
--- a/src/net/freertr/rtr/rtrLsrpIface.java
+++ b/src/net/freertr/rtr/rtrLsrpIface.java
@@ -529,7 +529,11 @@ public static void routerGetHelp(userHelping l) {
         l.add(null, "5 .           minimum                   take lowest");
         l.add(null, "5 .           average                   take average");
         l.add(null, "5 .           maximum                   take highest");
-        l.add(null, "5 .           differs                   take differences");
+        l.add(null, "5 .           summary                   take summary");
+        l.add(null, "5 .           dif-min                   take lowest of differences");
+        l.add(null, "5 .           dif-avg                   take average of differences");
+        l.add(null, "5 .           dif-max                   take highest of differences");
+        l.add(null, "5 .           dif-sum                   take summary of differences");
     }
 
     /**
diff --git a/src/net/freertr/rtr/rtrOspf4iface.java b/src/net/freertr/rtr/rtrOspf4iface.java
index af6c9f2ada..eb4edc76ab 100644
--- a/src/net/freertr/rtr/rtrOspf4iface.java
+++ b/src/net/freertr/rtr/rtrOspf4iface.java
@@ -871,7 +871,11 @@ public static void routerGetHelp(userHelping l) {
         l.add(null, "5 .           minimum               take lowest");
         l.add(null, "5 .           average               take average");
         l.add(null, "5 .           maximum               take highest");
-        l.add(null, "5 .           differs               take differences");
+        l.add(null, "5 .           summary               take summary");
+        l.add(null, "5 .           dif-min               take lowest of differences");
+        l.add(null, "5 .           dif-avg               take average of differences");
+        l.add(null, "5 .           dif-max               take highest of differences");
+        l.add(null, "5 .           dif-sum               take summary of differences");
     }
 
     /**
diff --git a/src/net/freertr/rtr/rtrOspf6iface.java b/src/net/freertr/rtr/rtrOspf6iface.java
index 943aa74654..28acf85521 100644
--- a/src/net/freertr/rtr/rtrOspf6iface.java
+++ b/src/net/freertr/rtr/rtrOspf6iface.java
@@ -786,7 +786,11 @@ public static void routerGetHelp(userHelping l) {
         l.add(null, "5 .           minimum               take lowest");
         l.add(null, "5 .           average               take average");
         l.add(null, "5 .           maximum               take highest");
-        l.add(null, "5 .           differs               take differences");
+        l.add(null, "5 .           summary               take summary");
+        l.add(null, "5 .           dif-min               take lowest of differences");
+        l.add(null, "5 .           dif-avg               take average of differences");
+        l.add(null, "5 .           dif-max               take highest of differences");
+        l.add(null, "5 .           dif-sum               take summary of differences");
     }
 
     /**
diff --git a/src/net/freertr/rtr/rtrPvrpIface.java b/src/net/freertr/rtr/rtrPvrpIface.java
index bf240805b4..b8bf30a939 100644
--- a/src/net/freertr/rtr/rtrPvrpIface.java
+++ b/src/net/freertr/rtr/rtrPvrpIface.java
@@ -572,7 +572,11 @@ public static void routerGetHelp(userHelping l) {
         l.add(null, "5 .           minimum                   take lowest");
         l.add(null, "5 .           average                   take average");
         l.add(null, "5 .           maximum                   take highest");
-        l.add(null, "5 .           differs                   take differences");
+        l.add(null, "5 .           summary                   take summary");
+        l.add(null, "5 .           dif-min                   take lowest of differences");
+        l.add(null, "5 .           dif-avg                   take average of differences");
+        l.add(null, "5 .           dif-max                   take highest of differences");
+        l.add(null, "5 .           dif-sum                   take summary of differences");
         l.add(null, "4 5         route-map-in                process prefixes in ingress updates");
         l.add(null, "5 .           <name:rm>                 name of route map");
         l.add(null, "4 5         route-map-out               process prefixes in egress updates");
diff --git a/src/net/freertr/tab/tabAverage.java b/src/net/freertr/tab/tabAverage.java
index 2a0dd9acc3..9796380c6b 100644
--- a/src/net/freertr/tab/tabAverage.java
+++ b/src/net/freertr/tab/tabAverage.java
@@ -11,7 +11,8 @@
 public class tabAverage {
 
     /**
-     * mode, 0=none, 1=min, 2=avg, 3=max, 4=diff
+     * mode, 0=none, 1=min, 2=avg, 3=max, 4=sum, 5=dif-min, 6=dif-avg,
+     * 7=dig-max, 8=dif-sum
      */
     public int algorithm = 1;
 
@@ -96,7 +97,15 @@ public String getAlgoName() {
             case 3:
                 return "maximum";
             case 4:
-                return "differs";
+                return "summary";
+            case 5:
+                return "dif-min";
+            case 6:
+                return "dif-avg";
+            case 7:
+                return "dif-max";
+            case 8:
+                return "dif-sum";
             default:
                 return "unknown=" + algorithm;
         }
@@ -124,10 +133,26 @@ public void string2algo(String a) {
             algorithm = 3;
             return;
         }
-        if (a.equals("differs")) {
+        if (a.equals("summary")) {
             algorithm = 4;
             return;
         }
+        if (a.equals("dif-min")) {
+            algorithm = 5;
+            return;
+        }
+        if (a.equals("dif-avg")) {
+            algorithm = 6;
+            return;
+        }
+        if (a.equals("dif-max")) {
+            algorithm = 7;
+            return;
+        }
+        if (a.equals("dif-sum")) {
+            algorithm = 8;
+            return;
+        }
         algorithm = 0;
     }
 
@@ -245,8 +270,67 @@ public int getResult(int met) {
                 }
                 break;
             case 4:
+                met = 0;
+                synchronized (vals) {
+                    for (int i = 0; i < vals.size(); i++) {
+                        int cur = vals.get(i);
+                        met += cur;
+                    }
+                }
+                break;
+            case 5:
+                met = Integer.MAX_VALUE;
+                synchronized (vals) {
+                    int prv = vals.get(0);
+                    for (int i = 1; i < vals.size(); i++) {
+                        int cur = vals.get(i);
+                        int dif = prv - cur;
+                        prv = cur;
+                        if (dif < 0) {
+                            dif = -dif;
+                        }
+                        if (dif < met) {
+                            met = dif;
+                        }
+                    }
+                }
+                break;
+            case 6:
+                met = 0;
+                synchronized (vals) {
+                    int prv = vals.get(0);
+                    for (int i = 1; i < vals.size(); i++) {
+                        int cur = vals.get(i);
+                        int dif = prv - cur;
+                        prv = cur;
+                        if (dif < 0) {
+                            dif = -dif;
+                        }
+                        met += dif;
+                    }
+                    met /= vals.size();
+                }
+                break;
+            case 7:
+                met = Integer.MIN_VALUE;
+                synchronized (vals) {
+                    int prv = vals.get(0);
+                    for (int i = 1; i < vals.size(); i++) {
+                        int cur = vals.get(i);
+                        int dif = prv - cur;
+                        prv = cur;
+                        if (dif < 0) {
+                            dif = -dif;
+                        }
+                        if (dif > met) {
+                            met = dif;
+                        }
+                    }
+                }
+                break;
+            case 8:
+                met = 0;
                 synchronized (vals) {
-                    met = 0;
                     int prv = vals.get(0);
                     for (int i = 1; i < vals.size(); i++) {
                         int cur = vals.get(i);
diff --git a/src/rtr.csv b/src/rtr.csv
index fdc02e9743..9b80a2c102 100644
--- a/src/rtr.csv
+++ b/src/rtr.csv
@@ -1,6 +1,6 @@
 url;file;result;test
 -;-;-;freeRouter v21.12.21-cur, done by cs@nop.
--;-;-;2021-12-21 19:29:05, took 00:06:43, with 100 workers, on 2516 cases, 0 failed, 0 traces, 2 retries
+-;-;-;2021-12-21 20:24:37, took 00:06:16, with 100 workers, on 2516 cases, 0 failed, 0 traces, 3 retries
 -;-;-;./rtr.bin
 http://sources.nop.hu/cfg/basic.tst;basic.tst;success;dummy test
 http://sources.nop.hu/cfg/conn-amt01.tst;conn-amt01.tst;success;amt over ipv4
diff --git a/src/rtr.html b/src/rtr.html
index 1ed4ea0668..21c8cc7a20 100644
--- a/src/rtr.html
+++ b/src/rtr.html
@@ -11,7 +11,7 @@
 </style>
 <title>tester</title></head><body>
 release: freeRouter v21.12.21-cur, done by cs@nop.<br/>
-tested: 2021-12-21 19:29:05, took 00:06:43, with 100 workers, on 2516 cases, 0 failed, 0 traces, 2 retries<br/>
+tested: 2021-12-21 20:24:37, took 00:06:16, with 100 workers, on 2516 cases, 0 failed, 0 traces, 3 retries<br/>
 jvm: ./rtr.bin<br/>
 <br/>
 <table><thead><tr><td><b>file</b></td><td><b>result</b></td><td><b>test</b></td></tr></thead><tbody>