diff --git a/code/bngblaster/src/bbl_ctrl.c b/code/bngblaster/src/bbl_ctrl.c
index 1ce603f0..c4ec6ffe 100644
--- a/code/bngblaster/src/bbl_ctrl.c
+++ b/code/bngblaster/src/bbl_ctrl.c
@@ -222,6 +222,8 @@ struct action actions[] = {
     {"isis-database", isis_ctrl_database, true},
     {"isis-load-mrt", isis_ctrl_load_mrt, false},
     {"isis-lsp-update", isis_ctrl_lsp_update, false},
+    {"isis-lsp-purge", isis_ctrl_lsp_purge, false},
+    {"isis-lsp-flap", isis_ctrl_lsp_flap, false},
     {"isis-teardown", isis_ctrl_teardown, false},
     {"bgp-sessions", bgp_ctrl_sessions, true},
     {"bgp-disconnect", bgp_ctrl_disconnect, false},
diff --git a/code/bngblaster/src/isis/isis.c b/code/bngblaster/src/isis/isis.c
index 9fcd4f3a..2c3e8dc7 100644
--- a/code/bngblaster/src/isis/isis.c
+++ b/code/bngblaster/src/isis/isis.c
@@ -183,7 +183,7 @@ isis_teardown()
             for(int i=0; i<ISIS_LEVELS; i++) {
                 if(instance->level[i].adjacency) {
                     isis_lsp_self_update(instance, i+1);
-                    isis_lsp_purge_external(instance, i+1);
+                    isis_lsp_purge_all_external(instance, i+1);
                 }
             }
 
diff --git a/code/bngblaster/src/isis/isis_adjacency.c b/code/bngblaster/src/isis/isis_adjacency.c
index 522c69f4..33549e50 100644
--- a/code/bngblaster/src/isis/isis_adjacency.c
+++ b/code/bngblaster/src/isis/isis_adjacency.c
@@ -102,7 +102,7 @@ isis_adjacency_up(isis_adjacency_s *adjacency)
     adjacency->state = ISIS_ADJACENCY_STATE_UP;
 
     timer_add_periodic(&g_ctx->timer_root, &adjacency->timer_tx, 
-        "ISIS TX", 0, config->lsp_tx_interval * MSEC, adjacency, &isis_lsp_sx_job);
+        "ISIS TX", 0, config->lsp_tx_interval * MSEC, adjacency, &isis_lsp_tx_job);
 
     timer_add_periodic(&g_ctx->timer_root, &adjacency->timer_retry, 
         "ISIS RETRY", config->lsp_retry_interval, 0, adjacency, &isis_lsp_retry_job);
diff --git a/code/bngblaster/src/isis/isis_ctrl.c b/code/bngblaster/src/isis/isis_ctrl.c
index 72900b0c..510017b6 100644
--- a/code/bngblaster/src/isis/isis_ctrl.c
+++ b/code/bngblaster/src/isis/isis_ctrl.c
@@ -9,6 +9,37 @@
 #include "isis.h"
 #include "../bbl_ctrl.h"
 
+isis_lsp_flap_s *g_isis_lsp_flap = NULL;
+
+
+#define ISIS_CTRL_ARG_INSTANCE(_arguments, _fd, _instance_id, _instance) \
+    do { \
+        if(json_unpack(_arguments, "{s:i}", "instance", &_instance_id) != 0) { \
+            return bbl_ctrl_status(_fd, "error", 400, "missing ISIS instance"); \
+        } \
+        /* Search for matching instance */ \
+        _instance = g_ctx->isis_instances; \
+        while(_instance) { \
+            if(_instance->config->id == _instance_id) { \
+                break; \
+            } \
+            _instance = _instance->next; \
+        } \
+        if(!_instance) { \
+            return bbl_ctrl_status(_fd, "error", 404, "ISIS instance not found"); \
+        } \
+    } while(0)
+
+#define ISIS_CTRL_ARG_LEVEL(_arguments, _fd, _level) \
+    do { \
+        if(json_unpack(_arguments, "{s:i}", "level", &_level) != 0) { \
+            return bbl_ctrl_status(_fd, "error", 400, "missing ISIS level"); \
+        } \
+        if(!(_level == ISIS_LEVEL_1 || _level == ISIS_LEVEL_2)) { \
+            return bbl_ctrl_status(_fd, "error", 400, "invalid ISIS level"); \
+        } \
+    } while(0)
+
 static json_t *
 isis_ctrl_adjacency(isis_adjacency_s *adjacency)
 {
@@ -180,36 +211,15 @@ isis_ctrl_database(int fd, uint32_t session_id __attribute__((unused)), json_t *
     json_t *root = NULL;
     json_t *database = NULL;
     isis_instance_s *instance = NULL;
-
     int instance_id = 0;
     int level = 0;
 
     /* Unpack further arguments */
-    if(json_unpack(arguments, "{s:i}", "instance", &instance_id) != 0) {
-        return bbl_ctrl_status(fd, "error", 400, "missing ISIS instance");
-    }
-    if(json_unpack(arguments, "{s:i}", "level", &level) != 0) {
-        return bbl_ctrl_status(fd, "error", 400, "missing ISIS level");
-    }
-    if(!(level == ISIS_LEVEL_1 || level == ISIS_LEVEL_2)) {
-        return bbl_ctrl_status(fd, "error", 400, "invalid ISIS level");
-    }
-
-    /* Search for matching instance */
-    instance = g_ctx->isis_instances;
-    while(instance) {
-        if(instance->config->id == instance_id) {
-            break;
-        }
-        instance = instance->next;
-    }
-
-    if(!instance) {
-        return bbl_ctrl_status(fd, "error", 400, "ISIS instance not found");
-    }
+    ISIS_CTRL_ARG_INSTANCE(arguments, fd, instance_id, instance);
+    ISIS_CTRL_ARG_LEVEL(arguments, fd, level);
 
     if(!instance->level[level-1].lsdb) {
-        return bbl_ctrl_status(fd, "error", 400, "ISIS database not found");
+        return bbl_ctrl_status(fd, "error", 404, "ISIS database not found");
     }
 
     database = isis_ctrl_database_entries(instance->level[level-1].lsdb);
@@ -235,31 +245,15 @@ int
 isis_ctrl_load_mrt(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments)
 {
     char *file_path;
+    isis_instance_s *instance = NULL;
     int instance_id = 0;
 
-    isis_instance_s *instance = NULL;
-
     /* Unpack further arguments */
+    ISIS_CTRL_ARG_INSTANCE(arguments, fd, instance_id, instance);
+
     if(json_unpack(arguments, "{s:s}", "file", &file_path) != 0) {
         return bbl_ctrl_status(fd, "error", 400, "missing MRT file");
     }
-    if(json_unpack(arguments, "{s:i}", "instance", &instance_id) != 0) {
-        return bbl_ctrl_status(fd, "error", 400, "missing ISIS instance");
-    }
-
-    /* Search for matching instance */
-    instance = g_ctx->isis_instances;
-    while(instance) {
-        if(instance->config->id == instance_id) {
-            break;
-        }
-        instance = instance->next;
-    }
-
-    if(!instance) {
-        return bbl_ctrl_status(fd, "error", 404, "ISIS instance not found");
-    }
-
     if(!isis_mrt_load(instance, file_path, false)) {
         return bbl_ctrl_status(fd, "error", 500, "failed to load ISIS MRT file");
     }
@@ -274,35 +268,19 @@ isis_ctrl_lsp_update(int fd, uint32_t session_id __attribute__((unused)), json_t
     json_t *value;
     size_t pdu_count;
 
-    int instance_id = 0;
-    isis_instance_s *instance = NULL;
 
     isis_pdu_s pdu = {0};
-
     const char *pdu_string;
     uint16_t pdu_string_len;
 
     uint8_t buf[ISIS_MAX_PDU_LEN];
     uint16_t len;
 
+    isis_instance_s *instance = NULL;
+    int instance_id = 0;
 
     /* Unpack further arguments */
-    if(json_unpack(arguments, "{s:i}", "instance", &instance_id) != 0) {
-        return bbl_ctrl_status(fd, "error", 400, "missing ISIS instance");
-    }
-
-    /* Search for matching instance */
-    instance = g_ctx->isis_instances;
-    while(instance) {
-        if(instance->config->id == instance_id) {
-            break;
-        }
-        instance = instance->next;
-    }
-
-    if(!instance) {
-        return bbl_ctrl_status(fd, "error", 404, "ISIS instance not found");
-    }
+    ISIS_CTRL_ARG_INSTANCE(arguments, fd, instance_id, instance);
 
     /* Process PDU array */
     value = json_object_get(arguments, "pdu");
@@ -323,7 +301,7 @@ isis_ctrl_lsp_update(int fd, uint32_t session_id __attribute__((unused)), json_t
                 return bbl_ctrl_status(fd, "error", 500, "failed to decode ISIS PDU");
             }
             /* Update external LSP */
-            if(!isis_lsp_update_external(instance, &pdu)) {
+            if(!isis_lsp_update_external(instance, &pdu, false)) {
                 return bbl_ctrl_status(fd, "error", 500, "failed to update ISIS LSP");
             }
         }
@@ -333,6 +311,151 @@ isis_ctrl_lsp_update(int fd, uint32_t session_id __attribute__((unused)), json_t
     return bbl_ctrl_status(fd, "ok", 200, NULL);
 }
 
+int
+isis_ctrl_lsp_purge(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments)
+{
+    json_t *value;
+
+    isis_lsp_s *lsp = NULL;
+    uint64_t lsp_id;
+
+    hb_tree *lsdb;
+    void **search = NULL;
+
+    isis_instance_s *instance = NULL;
+    int instance_id = 0;
+    int level = 0;
+
+    /* Unpack further arguments */
+    ISIS_CTRL_ARG_INSTANCE(arguments, fd, instance_id, instance);
+    ISIS_CTRL_ARG_LEVEL(arguments, fd, level);
+
+    if(!instance->level[level-1].lsdb) {
+        return bbl_ctrl_status(fd, "error", 404, "ISIS database not found");
+    }
+
+    value = json_object_get(arguments, "id");
+    if(json_is_string(value)) {
+        if(!isis_str_to_lsp_id(json_string_value(value), &lsp_id)) {
+            return bbl_ctrl_status(fd, "error", 400, "invalid ISIS LSP identifier");
+        }
+        lsdb = instance->level[level-1].lsdb;
+        search = hb_tree_search(lsdb, &lsp_id);
+        if(search) {
+            lsp = *search;
+            if(lsp && lsp->source.type == ISIS_SOURCE_EXTERNAL) {
+                isis_lsp_purge(lsp);
+            } else {
+                return bbl_ctrl_status(fd, "error", 500, "failed to purge ISIS LSP");
+            }
+        } else {
+            return bbl_ctrl_status(fd, "error", 404, "ISIS LSP not found");
+        }
+    } else {
+        return bbl_ctrl_status(fd, "error", 400, "missing ISIS LSP identifier");
+    }
+    return bbl_ctrl_status(fd, "ok", 200, NULL);
+}
+
+void
+isis_ctrl_lsp_flap_job(timer_s *timer)
+{
+    isis_lsp_flap_s *flap = timer->data;
+    uint32_t seq;
+
+    if(flap) {
+        seq = be32toh(*(uint32_t*)PDU_OFFSET(&flap->pdu, ISIS_OFFSET_LSP_SEQ));
+        *(uint32_t*)PDU_OFFSET(&flap->pdu, ISIS_OFFSET_LSP_SEQ) = htobe32(++seq);
+
+        if(!isis_lsp_update_external(flap->instance, &flap->pdu, true)) {
+            LOG(ISIS, "Failed to flap ISIS LSP %s\n", isis_lsp_id_to_str(&flap->id));
+        }
+        flap->free = true;
+    }
+}
+
+static isis_lsp_flap_s *
+isis_ctrl_lsp_flap_new(isis_lsp_s *lsp)
+{
+    isis_lsp_flap_s *flap = g_isis_lsp_flap;
+
+    while(flap) {
+        if(flap->free) {
+            break;
+        }
+        flap = flap->next;
+    }
+    if(!flap) {
+        flap = calloc(1, sizeof(isis_lsp_flap_s));
+        flap->next = g_isis_lsp_flap;
+        g_isis_lsp_flap = flap;
+    }
+
+    flap->free = false;
+    flap->timer = NULL;
+    flap->id = lsp->id;
+    flap->instance = lsp->instance;
+    memcpy(&flap->pdu, &lsp->pdu, sizeof(isis_pdu_s));
+
+    return flap;
+}
+
+int
+isis_ctrl_lsp_flap(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments)
+{
+    json_t *value;
+
+    isis_lsp_s *lsp = NULL;
+    uint64_t lsp_id;
+
+    time_t timer = 30;
+    hb_tree *lsdb;
+    void **search = NULL;
+
+    isis_lsp_flap_s *flap;
+
+    isis_instance_s *instance = NULL;
+    int instance_id = 0;
+    int level = 0;
+
+    /* Unpack further arguments */
+    ISIS_CTRL_ARG_INSTANCE(arguments, fd, instance_id, instance);
+    ISIS_CTRL_ARG_LEVEL(arguments, fd, level);
+
+    if(!instance->level[level-1].lsdb) {
+        return bbl_ctrl_status(fd, "error", 404, "ISIS database not found");
+    }
+
+    value = json_object_get(arguments, "timer");
+    if(json_is_number(value)) {
+        timer = json_number_value(value);
+    }
+
+    value = json_object_get(arguments, "id");
+    if(json_is_string(value)) {
+        if(!isis_str_to_lsp_id(json_string_value(value), &lsp_id)) {
+            return bbl_ctrl_status(fd, "error", 400, "invalid ISIS LSP identifier");
+        }
+        lsdb = instance->level[level-1].lsdb;
+        search = hb_tree_search(lsdb, &lsp_id);
+        if(search) {
+            lsp = *search;
+            if(lsp && lsp->source.type == ISIS_SOURCE_EXTERNAL) {
+                flap = isis_ctrl_lsp_flap_new(lsp);
+                timer_add(&g_ctx->timer_root, &flap->timer, "ISIS FLAP", timer, 0, flap, &isis_ctrl_lsp_flap_job);
+                isis_lsp_purge(lsp);
+            } else {
+                return bbl_ctrl_status(fd, "error", 500, "failed to flap ISIS LSP");
+            }
+        } else {
+            return bbl_ctrl_status(fd, "error", 404, "ISIS LSP not found");
+        }
+    } else {
+        return bbl_ctrl_status(fd, "error", 400, "missing ISIS LSP identifier");
+    }
+    return bbl_ctrl_status(fd, "ok", 200, NULL);
+}
+
 int
 isis_ctrl_teardown(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments __attribute__((unused))) 
 {
diff --git a/code/bngblaster/src/isis/isis_ctrl.h b/code/bngblaster/src/isis/isis_ctrl.h
index 0f384582..d307da62 100644
--- a/code/bngblaster/src/isis/isis_ctrl.h
+++ b/code/bngblaster/src/isis/isis_ctrl.h
@@ -21,6 +21,12 @@ isis_ctrl_load_mrt(int fd, uint32_t session_id __attribute__((unused)), json_t *
 int
 isis_ctrl_lsp_update(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments);
 
+int
+isis_ctrl_lsp_purge(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments);
+
+int
+isis_ctrl_lsp_flap(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments);
+
 int
 isis_ctrl_teardown(int fd, uint32_t session_id __attribute__((unused)), json_t *arguments __attribute__((unused)));
 
diff --git a/code/bngblaster/src/isis/isis_def.h b/code/bngblaster/src/isis/isis_def.h
index e7235862..bf1219ae 100644
--- a/code/bngblaster/src/isis/isis_def.h
+++ b/code/bngblaster/src/isis/isis_def.h
@@ -382,4 +382,16 @@ typedef struct isis_flood_entry_ {
     struct timespec tx_timestamp;
 } isis_flood_entry_s;
 
+typedef struct isis_lsp_flap_ {
+    uint64_t id; /* LSP-ID */
+
+    isis_instance_s *instance;
+    isis_pdu_s pdu;
+
+    bool free;
+    struct timer_ *timer;
+
+    struct isis_lsp_flap_ *next;
+} isis_lsp_flap_s;
+
 #endif
\ No newline at end of file
diff --git a/code/bngblaster/src/isis/isis_lsp.c b/code/bngblaster/src/isis/isis_lsp.c
index eefb330e..7170d18b 100644
--- a/code/bngblaster/src/isis/isis_lsp.c
+++ b/code/bngblaster/src/isis/isis_lsp.c
@@ -148,7 +148,6 @@ void
 isis_lsp_gc_job(timer_s *timer)
 {
     isis_instance_s *instance = timer->data;
-
     isis_lsp_s *lsp;
     hb_itor *itor;
     bool next;
@@ -277,7 +276,7 @@ isis_lsp_refresh_job(timer_s *timer)
 }
 
 void
-isis_lsp_sx_job(timer_s *timer)
+isis_lsp_tx_job(timer_s *timer)
 {
     isis_adjacency_s *adjacency = timer->data;
     isis_flood_entry_s *entry;
@@ -703,77 +702,87 @@ ACK:
 }
 
 /**
- * isis_lsp_purge_external 
+ * isis_lsp_purge
+ * 
+ * @param lsp  ISIS LSP
+ */
+void
+isis_lsp_purge(isis_lsp_s *lsp)
+{
+    isis_pdu_s *pdu;
+    isis_auth_type auth_type = ISIS_AUTH_NONE;
+
+    isis_config_s *config = lsp->instance->config;
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+
+    lsp->seq++;
+    lsp->timestamp.tv_sec = now.tv_sec;
+    lsp->timestamp.tv_nsec = now.tv_nsec;
+
+    lsp->lifetime = 0;
+    isis_lsp_lifetime(lsp);
+
+    /* Build PDU */
+    pdu = &lsp->pdu;
+    if(lsp->level == ISIS_LEVEL_1) {
+        isis_pdu_init(pdu, ISIS_PDU_L1_LSP);
+        auth_type = config->level1_auth;
+        lsp->auth_key = config->level1_key;
+    } else {
+        isis_pdu_init(pdu, ISIS_PDU_L2_LSP);
+        auth_type = config->level2_auth;
+        lsp->auth_key = config->level2_key;
+    }
+
+    /* PDU header. */
+    isis_pdu_add_u16(pdu, 0);
+    isis_pdu_add_u16(pdu, 0);
+    isis_pdu_add_u64(pdu, lsp->id);
+    isis_pdu_add_u32(pdu, lsp->seq);
+    isis_pdu_add_u16(pdu, 0);
+    isis_pdu_add_u8(pdu, 0x03); 
+
+    /* TLV section. */
+    isis_pdu_add_tlv_auth(pdu, auth_type, lsp->auth_key);
+
+    /* Update length and authentication. */
+    isis_pdu_update_len(pdu);
+    isis_pdu_update_auth(pdu, lsp->auth_key);
+
+    /* Set checksum and lifetime to zero. */
+    *(uint16_t*)PDU_OFFSET(pdu, ISIS_OFFSET_LSP_LIFETIME) = 0;
+    *(uint16_t*)PDU_OFFSET(pdu, ISIS_OFFSET_LSP_CHECKSUM) = 0;
+
+    isis_lsp_flood(lsp);
+}
+
+/**
+ * isis_lsp_purge_all_external 
  * 
  * @param instance  ISIS instance
  * @param level ISIS level
  */
 void
-isis_lsp_purge_external(isis_instance_s *instance, uint8_t level)
+isis_lsp_purge_all_external(isis_instance_s *instance, uint8_t level)
 {
-    isis_config_s *config = instance->config;
     hb_tree *lsdb = instance->level[level-1].lsdb;
 
     isis_lsp_s *lsp;
     hb_itor *itor;
     bool next;
 
-    isis_pdu_s *pdu;
-    isis_auth_type auth_type = ISIS_AUTH_NONE;
-
-    struct timespec now;
-
     if(!lsdb) {
         return;
     }
 
-    clock_gettime(CLOCK_MONOTONIC, &now);
-
     itor = hb_itor_new(lsdb);
     next = hb_itor_first(itor);
 
     while(next) {
         lsp = *hb_itor_datum(itor);
         if(lsp && lsp->source.type == ISIS_SOURCE_EXTERNAL) {
-            lsp->seq++;
-            lsp->timestamp.tv_sec = now.tv_sec;
-            lsp->timestamp.tv_nsec = now.tv_nsec;
-
-            lsp->lifetime = 0;
-            isis_lsp_lifetime(lsp);
-
-            /* Build PDU */
-            pdu = &lsp->pdu;
-            if(level == ISIS_LEVEL_1) {
-                isis_pdu_init(pdu, ISIS_PDU_L1_LSP);
-                auth_type = config->level1_auth;
-                lsp->auth_key = config->level1_key;
-            } else {
-                isis_pdu_init(pdu, ISIS_PDU_L2_LSP);
-                auth_type = config->level2_auth;
-                lsp->auth_key = config->level2_key;
-            }
-        
-            /* PDU header. */
-            isis_pdu_add_u16(pdu, 0);
-            isis_pdu_add_u16(pdu, 0);
-            isis_pdu_add_u64(pdu, lsp->id);
-            isis_pdu_add_u32(pdu, lsp->seq);
-            isis_pdu_add_u16(pdu, 0);
-            isis_pdu_add_u8(pdu, 0x03); 
-
-            /* TLV section. */
-            isis_pdu_add_tlv_auth(pdu, auth_type, lsp->auth_key);
-
-            /* Update length and authentication. */
-            isis_pdu_update_len(pdu);
-            isis_pdu_update_auth(pdu, lsp->auth_key);
-
-            /* Set checksum and lifetime to zero. */
-            *(uint16_t*)PDU_OFFSET(pdu, ISIS_OFFSET_LSP_LIFETIME) = 0;
-            *(uint16_t*)PDU_OFFSET(pdu, ISIS_OFFSET_LSP_CHECKSUM) = 0;
-
-            isis_lsp_flood(lsp);
+            isis_lsp_purge(lsp);
         }
         next = hb_itor_next(itor);
     }
@@ -784,9 +793,10 @@ isis_lsp_purge_external(isis_instance_s *instance, uint8_t level)
  * 
  * @param instance ISIS instance
  * @param pdu received ISIS PDU
+ * @param refresh automatically refresh LSP
  */
 bool
-isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu)
+isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu, bool refresh)
 {
     uint8_t level;
 
@@ -854,7 +864,8 @@ isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu)
         if(lsp->lifetime < ISIS_DEFAULT_LSP_LIFETIME_MIN) {
             /* Increase ISIS lifetime. */
             lsp->lifetime = ISIS_DEFAULT_LSP_LIFETIME_MIN;
-            isis_lsp_refresh(lsp); 
+            isis_lsp_refresh(lsp);
+            refresh = false;
         }
         refresh_interval = lsp->lifetime - 300;
         timer_add_periodic(&g_ctx->timer_root, &lsp->timer_refresh, 
@@ -864,6 +875,10 @@ isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu)
         isis_lsp_lifetime(lsp);
     }
 
-    isis_lsp_flood(lsp);
+    if(refresh) {
+        isis_lsp_refresh(lsp); 
+    } else { 
+        isis_lsp_flood(lsp);
+    }
     return true;
 }
\ No newline at end of file
diff --git a/code/bngblaster/src/isis/isis_lsp.h b/code/bngblaster/src/isis/isis_lsp.h
index cc156f9a..a4f64d3b 100644
--- a/code/bngblaster/src/isis/isis_lsp.h
+++ b/code/bngblaster/src/isis/isis_lsp.h
@@ -34,7 +34,7 @@ void
 isis_lsp_lifetime(isis_lsp_s *lsp);
 
 void
-isis_lsp_sx_job(timer_s *timer);
+isis_lsp_tx_job(timer_s *timer);
 
 isis_lsp_s *
 isis_lsp_new(uint64_t id, uint8_t level, isis_instance_s *instance);
@@ -46,9 +46,12 @@ void
 isis_lsp_handler_rx(bbl_network_interface_s *interface, isis_pdu_s *pdu, uint8_t level);
 
 void
-isis_lsp_purge_external(isis_instance_s *instance, uint8_t level);
+isis_lsp_purge(isis_lsp_s *lsp);
+
+void
+isis_lsp_purge_all_external(isis_instance_s *instance, uint8_t level);
 
 bool
-isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu);
+isis_lsp_update_external(isis_instance_s *instance, isis_pdu_s *pdu, bool refresh);
 
 #endif
\ No newline at end of file
diff --git a/code/bngblaster/src/isis/isis_utils.c b/code/bngblaster/src/isis/isis_utils.c
index 732a769c..3642dae4 100644
--- a/code/bngblaster/src/isis/isis_utils.c
+++ b/code/bngblaster/src/isis/isis_utils.c
@@ -197,6 +197,30 @@ isis_system_id_to_str(uint8_t *system_id)
     return ret;
 }
 
+/**
+ * isis_str_to_lsp_id
+ *
+ * @param str IS-IS lsp-id string
+ * @param lsp_id IS-IS lsp-id (8 bytes)
+ * @return true if successful
+ */
+bool
+isis_str_to_lsp_id(const char *str, uint64_t *lsp_id)
+{
+    sscanf(str, "%hx.%hx.%hx.%hhx-%hhx", 
+           &((uint16_t*)lsp_id)[3], 
+           &((uint16_t*)lsp_id)[2], 
+           &((uint16_t*)lsp_id)[1], 
+           &((uint8_t*)lsp_id)[1],
+           &((uint8_t*)lsp_id)[0]);
+
+    ((uint16_t*)lsp_id)[3] = ((uint16_t*)lsp_id)[3];
+    ((uint16_t*)lsp_id)[2] = ((uint16_t*)lsp_id)[2];
+    ((uint16_t*)lsp_id)[1] = ((uint16_t*)lsp_id)[1];
+
+    return true;
+}
+
 /**
  * isis_lsp_id_to_str
  *
diff --git a/code/bngblaster/src/isis/isis_utils.h b/code/bngblaster/src/isis/isis_utils.h
index ec4993b9..843913f1 100644
--- a/code/bngblaster/src/isis/isis_utils.h
+++ b/code/bngblaster/src/isis/isis_utils.h
@@ -36,6 +36,9 @@ isis_str_to_system_id(const char *str, uint8_t *system_id);
 char *
 isis_system_id_to_str(uint8_t *system_id);
 
+bool
+isis_str_to_lsp_id(const char *str, uint64_t *lsp_id);
+
 char *
 isis_lsp_id_to_str(uint64_t *lsp_id);
 
diff --git a/code/common/src/logging.h b/code/common/src/logging.h
index 1555a624..64c271c9 100644
--- a/code/common/src/logging.h
+++ b/code/common/src/logging.h
@@ -89,7 +89,7 @@ extern uint8_t g_log_buf_cur;
                 } \
             } \
         } \
-     } while(0)
+    } while(0)
 
 #define LOG_NOARG(log_id_, fmt_) \
     do { \
@@ -114,7 +114,7 @@ extern uint8_t g_log_buf_cur;
                 } \
             } \
         } \
-     } while(0)
+    } while(0)
 
 #else 
 #define LOG(log_id_, fmt_, ...) \
@@ -128,7 +128,7 @@ extern uint8_t g_log_buf_cur;
                 fprintf(stdout, "%s "fmt_, log_format_timestamp(), ##__VA_ARGS__); \
             } \
         } \
-     } while(0)
+    } while(0)
 
 #define LOG_NOARG(log_id_, fmt_) \
     do { \
@@ -141,7 +141,7 @@ extern uint8_t g_log_buf_cur;
                 fprintf(stdout, "%s "fmt_, log_format_timestamp()); \
             } \
         } \
-     } while(0)
+    } while(0)
 #endif