diff --git a/data/grid5000/sites/nancy/network_equipments/gw.json b/data/grid5000/sites/nancy/network_equipments/gw.json
index 9587f52b1fbfef2940ea26cfe9a497ed639977fb..da39c9e0c6074520abb49679ae0e4ebc9382b9a0 100644
--- a/data/grid5000/sites/nancy/network_equipments/gw.json
+++ b/data/grid5000/sites/nancy/network_equipments/gw.json
@@ -20,7 +20,7 @@
     "port-channel4": {
       "kind": "switch",
       "port": "port-channel1",
-      "rate": 1000000000000,
+      "rate": 800000000000,
       "uid": "sgrappe"
     }
   },
@@ -1498,6 +1498,22 @@
           "port": "eth3",
           "snmp_name": "Ethernet5/48",
           "uid": "grimoire-8"
+        },
+        {
+        },
+        {
+        },
+        {
+          "kind": "channel",
+          "rate": 40000000000,
+          "snmp_name": "Ethernet5/51",
+          "uid": "port-channel4"
+        },
+        {
+          "kind": "channel",
+          "rate": 40000000000,
+          "snmp_name": "Ethernet5/52",
+          "uid": "port-channel4"
         }
       ],
       "rate": 10000000000,
diff --git a/data/grid5000/sites/nancy/network_equipments/sgrappe.json b/data/grid5000/sites/nancy/network_equipments/sgrappe.json
index 260bd21c36b137966c476958015cc29ee7edfa6e..0f9ca66487e5ea0823d534958e9964c59f6a6a69 100644
--- a/data/grid5000/sites/nancy/network_equipments/sgrappe.json
+++ b/data/grid5000/sites/nancy/network_equipments/sgrappe.json
@@ -1,9 +1,10 @@
 {
+  "backplane_bps": 2160000000000,
   "channels": {
     "port-channel1": {
       "kind": "router",
       "port": "port-channel4",
-      "rate": 1000000000000,
+      "rate": 800000000000,
       "uid": "gw"
     }
   },
@@ -13,7 +14,7 @@
     {
     },
     {
-      "kavlan_pattern": "Ethernet%LINECARD%/%PORT%",
+      "kavlan_pattern": "Ethernet1%LINECARD%/%PORT%",
       "kind": "node",
       "ports": [
         {
diff --git a/data/grid5000/sites/nancy/network_equipments/sgros1.json b/data/grid5000/sites/nancy/network_equipments/sgros1.json
index b122e55233e138fb406abdc0771ece6a7905ef18..e6780b89668abc13eecdba6a34d463dce5b3eaa8 100644
--- a/data/grid5000/sites/nancy/network_equipments/sgros1.json
+++ b/data/grid5000/sites/nancy/network_equipments/sgros1.json
@@ -1,5 +1,5 @@
 {
-  "backplane_bps": 6400000000000,
+  "backplane_bps": 12800000000000,
   "channels": {
     "port-channel1": {
       "kind": "router",
diff --git a/data/grid5000/sites/nancy/network_equipments/sgros2.json b/data/grid5000/sites/nancy/network_equipments/sgros2.json
index 88050be1a188542c4a826188b3304739df8d106a..9c1cac20d07af3028a7bf44838568472fc762a61 100644
--- a/data/grid5000/sites/nancy/network_equipments/sgros2.json
+++ b/data/grid5000/sites/nancy/network_equipments/sgros2.json
@@ -1,5 +1,5 @@
 {
-  "backplane_bps": 6400000000000,
+  "backplane_bps": 12800000000000,
   "channels": {
     "port-channel1": {
       "kind": "router",
diff --git a/input/grid5000/sites/nancy/networks/gw-nancy.yaml b/input/grid5000/sites/nancy/networks/gw-nancy.yaml
index 7db7d8e074610fc6fef96de7b1bfcfaf2c7c2606..dd6c135c58de336fd35546b62baef702dfc47ecc 100644
--- a/input/grid5000/sites/nancy/networks/gw-nancy.yaml
+++ b/input/grid5000/sites/nancy/networks/gw-nancy.yaml
@@ -609,6 +609,15 @@ gw:
           uid: grimoire-7-eth3
         48:
           uid: grimoire-8-eth3
+        51:
+          uid: port-channel4
+          kind: channel
+          rate: 40_000_000_000
+        52:
+          uid: port-channel4
+          kind: channel
+          rate: 40_000_000_000
+
     6:
       snmp_pattern: "Ethernet%LINECARD%/%PORT%"
       kavlan_pattern: "Ethernet%LINECARD%/%PORT%"
@@ -805,5 +814,5 @@ gw:
       port: port-channel1
       uid: sgrappe
       kind: switch
-      rate: 1000000000000     
+      rate: 800000000000
     
diff --git a/input/grid5000/sites/nancy/networks/sgrappe.yaml b/input/grid5000/sites/nancy/networks/sgrappe.yaml
index a21baa46bae9f26639ffe380b410162ed4a8c084..e55cc334b6ace9f6deb2c3bf58fbc23e40fb2b67 100644
--- a/input/grid5000/sites/nancy/networks/sgrappe.yaml
+++ b/input/grid5000/sites/nancy/networks/sgrappe.yaml
@@ -7,10 +7,11 @@ sgrappe:
   site: nancy
   snmp_community: public
   ip: 172.17.79.205
+  backplane_bps: 2160000000000
   linecards:
     1:
       snmp_pattern: "Ethernet1/%LINECARD%/%PORT%"
-      kavlan_pattern: "Ethernet%LINECARD%/%PORT%"
+      kavlan_pattern: "Ethernet1%LINECARD%/%PORT%"
       kind: node
       rate: 25000000000
       ports:
@@ -57,4 +58,4 @@ sgrappe:
       port: port-channel4
       uid: gw
       kind: router
-      rate: 1000000000000
+      rate: 800000000000
diff --git a/input/grid5000/sites/nancy/networks/sgros1.yaml b/input/grid5000/sites/nancy/networks/sgros1.yaml
index b266cd92252c734c8137e28b8a6a4f95e3562dc7..f5544fde248d60b08a4db9f700355c96cade800a 100644
--- a/input/grid5000/sites/nancy/networks/sgros1.yaml
+++ b/input/grid5000/sites/nancy/networks/sgros1.yaml
@@ -7,7 +7,7 @@ sgros1:
   site: nancy
   snmp_community: public
   ip: 172.17.79.208
-  backplane_bps: 6400000000000
+  backplane_bps: 12800000000000
   metrics:
     - name: network_ifacein_bytes_total
       description: Input byte counter for the network device port
diff --git a/input/grid5000/sites/nancy/networks/sgros2.yaml b/input/grid5000/sites/nancy/networks/sgros2.yaml
index 26f143e526a57e5bba649e9d72c7ac87c139d101..17b686734297c3befcdcfe950d17937d7cc9d7c5 100644
--- a/input/grid5000/sites/nancy/networks/sgros2.yaml
+++ b/input/grid5000/sites/nancy/networks/sgros2.yaml
@@ -20,7 +20,7 @@ sgros2:
         protocol: snmp
         id: 1.3.6.1.2.1.2.2.1.16.{{ 1.3.6.1.2.1.2.2.1.2 == %SNMP_IFACE% }}
   ip: 172.17.79.209
-  backplane_bps: 6400000000000
+  backplane_bps: 12800000000000
   linecards:
     1:
       snmp_pattern: "ethernet1/1/%PORT%:1"