Hi guys,
In the mfib one ingress interface Correspond to multiple egress interface. Then
how can I configure this.
In addtion, a multicast message next hop will be 'next0 =
IP4_INPUT_NEXT_LOOKUP_MULTICAST' and lookup in mfib:
if (PREDICT_FALSE (ip4_address_is_multicast (&ip0->dst_address))) //This
multicast message include 224.0.0.0/8
{
arc0 = lm->mcast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP_MULTICAST;
}
else
{
arc0 = lm->ucast_feature_arc_index;
next0 = IP4_INPUT_NEXT_LOOKUP;
if (PREDICT_FALSE (ip0->ttl < 1))
error0 = IP4_ERROR_TIME_EXPIRED;
}
In the fib I can configure a route about 224.0.0.0/8 .In the mfib I can also
configure a route about 224.0.0.5/32 .
When I configure a route about 224.0.0.5/32 in mfib. The multicast message
start with 224 will lookup in mfib. But it will be dropped.
Is that a mistake?
DBGvpp# show ip fib
ipv4-VRF:0, fib_index 0, flow hash: src dst sport dport proto
0.0.0.0/0
unicast-ip4-chain
[@0]: dpo-load-balance: [index:0 buckets:1 uRPF:0 to:[0:0]]
[0] [@0]: dpo-drop ip4
0.0.0.0/32
unicast-ip4-chain
[@0]: dpo-load-balance: [index:1 buckets:1 uRPF:1 to:[0:0]]
[0] [@0]: dpo-drop ip4
1.1.1.0/24
unicast-ip4-chain
[@0]: dpo-load-balance: [index:12 buckets:1 uRPF:11 to:[0:0]]
[0] [@4]: ipv4-glean: host-eth2
1.1.1.1/32
unicast-ip4-chain
[@0]: dpo-load-balance: [index:13 buckets:1 uRPF:12 to:[0:0]]
[0] [@2]: dpo-receive: 1.1.1.1 on host-eth2
224.0.0.0/8
unicast-ip4-chain
[@0]: dpo-load-balance: [index:3 buckets:1 uRPF:3 to:[0:0]]
[0] [@0]: dpo-drop ip4
240.0.0.0/8
unicast-ip4-chain
[@0]: dpo-load-balance: [index:2 buckets:1 uRPF:2 to:[0:0]]
[0] [@0]: dpo-drop ip4
255.255.255.255/32
unicast-ip4-chain
[@0]: dpo-load-balance: [index:4 buckets:1 uRPF:4 to:[0:0]]
[0] [@0]: dpo-drop ip4
In my opinion ,the multicast message which start with 224 is usually the
porotocol message, should not have the same process with the multicast message
start with 225-239.
Please help me point out the problem of my idea.
Thanks,
xyxue
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