Add support for route tags

Credit
------
A huge amount of credit for this patch goes to Piotr Chytla for
their 'route tags support' patch that was submitted to quagga-dev
in June 2007.

Documentation
-------------
All ipv4 and ipv6 static route commands now have a "tag" option
which allows the user to set a tag between 1 and 65535.

quagga(config)# ip route 1.1.1.1/32 10.1.1.1 tag ?
  <1-65535>  Tag value
quagga(config)# ip route 1.1.1.1/32 10.1.1.1 tag 40
quagga(config)#

quagga# show ip route 1.1.1.1/32
Routing entry for 1.1.1.1/32
  Known via "static", distance 1, metric 0, tag 40, best
  * 10.1.1.1, via swp1

quagga#

The route-map parser supports matching on tags and setting tags
!
route-map MATCH_TAG_18 permit 10
 match tag 18
!

!
route-map SET_TAG_22 permit 10
 set tag 22
!

BGP and OSPF support:
- matching on tags when redistribing routes from the RIB into BGP/OSPF.
- setting tags when redistribing routes from the RIB into BGP/OSPF.

BGP also supports setting a tag via a table-map, when installing BGP
routes into the RIB.

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/ospfd/ospfd.c b/ospfd/ospfd.c
index 4cddca67d..272c544bc 100644
--- a/ospfd/ospfd.c
+++ b/ospfd/ospfd.c
@@ -189,6 +189,7 @@ ospf_new (void)
     {
       new->dmetric[i].type = -1;
       new->dmetric[i].value = -1;
+      new->dtag[i] = 0;
     }
   new->default_metric = -1;
   new->ref_bandwidth = OSPF_DEFAULT_REF_BANDWIDTH;