isisd: Attached-bit in LSP header
Set/reset attached-bit in LSP header:
This patch provides support for set/reset attached_bit in the LSP header.
In IS-IS networks, routing inter-area traffic from L1 areas is
accomplished by sending the traffic to the nearest L1/L2 router.
A L1/L2 router identifies itself by setting an attach-bit (ATT-bit) in its (LSP).
The ATT-bit in LSP can be changed using the set-attached-bit or
no-set-attached-bit commands (similar to ‘set-overload-bit’ and
'no set-overload-bit’) using telnet terminal in router configuration mode.
Steps:
enable
configure terminal
router isis <Routing area>
set-attached-bit
V2: Removed looping through area list as this well set the bit for all
areas in the list. This implementation now looks exactly like the
current overload bit implementation.
Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com>
diff --git a/isisd/isisd.c b/isisd/isisd.c
index 898dfd2..20b8e50 100644
--- a/isisd/isisd.c
+++ b/isisd/isisd.c
@@ -2170,6 +2170,39 @@
return CMD_SUCCESS;
}
+DEFUN (set_attached_bit,
+ set_attached_bit_cmd,
+ "set-attached-bit",
+ "Set attached bit to identify as L1/L2 router for inter-area traffic\n"
+ "Set attached bit\n")
+{
+ struct isis_area *area;
+
+ area = vty->index;
+ assert (area);
+
+ area->attached_bit = LSPBIT_ATT;
+ lsp_regenerate_schedule (area, IS_LEVEL_1 | IS_LEVEL_2, 1);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_set_attached_bit,
+ no_set_attached_bit_cmd,
+ "no set-attached-bit",
+ "Reset attached bit\n")
+{
+ struct isis_area *area;
+
+ area = vty->index;
+ assert (area);
+
+ area->attached_bit = 0;
+ lsp_regenerate_schedule (area, IS_LEVEL_1 | IS_LEVEL_2, 1);
+
+ return CMD_SUCCESS;
+}
+
DEFUN (dynamic_hostname,
dynamic_hostname_cmd,
"hostname dynamic",
@@ -3245,6 +3278,9 @@
install_element (ISIS_NODE, &set_overload_bit_cmd);
install_element (ISIS_NODE, &no_set_overload_bit_cmd);
+ install_element (ISIS_NODE, &set_attached_bit_cmd);
+ install_element (ISIS_NODE, &no_set_attached_bit_cmd);
+
install_element (ISIS_NODE, &dynamic_hostname_cmd);
install_element (ISIS_NODE, &no_dynamic_hostname_cmd);