MPLS Mcast
1 - interface-DPO
Used in the Data-plane to change a packet's input interface
2 - MPLS multicast FIB entry
Same as a unicast entry but it links to a replicate not a load-balance DPO
3 - Multicast MPLS tunnel
Update MPLS tunnels to use a FIB path-list to describe the endpoint[s]. Use the path-list to generate the forwarding chain (DPOs) to link to .
4 - Resolve a path via a local label (of an mLDP LSP)
For IP multicast entries to use an LSP in the replication list, we need to decribe the 'resolve-via-label' where the label is that of a multicast LSP.
5 - MPLS disposition path sets RPF-ID
For a interface-less LSP (i.e. mLDP not RSVP-TE) at the tail of the LSP we still need to perform an RPF check. An MPLS disposition DPO performs the MPLS pop validation checks and sets the RPF-ID in the packet.
6 - RPF check with per-entry RPF-ID
An RPF-ID is used instead of a real interface SW if index in the case the IP traffic arrives from an LSP that does not have an associated interface.
Change-Id: Ib92e177be919147bafeb599729abf3d1abc2f4b3
Signed-off-by: Neale Ranns <nranns@cisco.com>
diff --git a/src/vnet/fib/mpls_fib.c b/src/vnet/fib/mpls_fib.c
index 4b2b76e..19f9f3c 100644
--- a/src/vnet/fib/mpls_fib.c
+++ b/src/vnet/fib/mpls_fib.c
@@ -165,6 +165,7 @@
lookup_dpo_add_or_lock_w_fib_index(0, // unused
DPO_PROTO_IP4,
+ LOOKUP_UNICAST,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_INPUT_INTERFACE,
&dpo);
@@ -179,6 +180,7 @@
lookup_dpo_add_or_lock_w_fib_index(0, //unsued
DPO_PROTO_MPLS,
+ LOOKUP_UNICAST,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_INPUT_INTERFACE,
&dpo);
@@ -197,6 +199,7 @@
lookup_dpo_add_or_lock_w_fib_index(0, //unused
DPO_PROTO_IP6,
+ LOOKUP_UNICAST,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_INPUT_INTERFACE,
&dpo);
@@ -210,6 +213,7 @@
prefix.fp_eos = MPLS_NON_EOS;
lookup_dpo_add_or_lock_w_fib_index(0, // unsued
DPO_PROTO_MPLS,
+ LOOKUP_UNICAST,
LOOKUP_INPUT_DST_ADDR,
LOOKUP_TABLE_FROM_INPUT_INTERFACE,
&dpo);
@@ -320,8 +324,15 @@
{
mpls_label_t key;
- ASSERT(DPO_LOAD_BALANCE == dpo->dpoi_type);
-
+ ASSERT((DPO_LOAD_BALANCE == dpo->dpoi_type) ||
+ (DPO_REPLICATE == dpo->dpoi_type));
+ if (CLIB_DEBUG > 0)
+ {
+ if (DPO_REPLICATE == dpo->dpoi_type)
+ ASSERT(dpo->dpoi_index & MPLS_IS_REPLICATE);
+ if (DPO_LOAD_BALANCE == dpo->dpoi_type)
+ ASSERT(!(dpo->dpoi_index & MPLS_IS_REPLICATE));
+ }
key = mpls_fib_entry_mk_key(label, eos);
mf->mf_lbs[key] = dpo->dpoi_index;