Has anyone on this list had any experiences with BGP Policy
Accounting used in conjunction with label switching (or
tag-switching for that matter).
I'm attempting to use BGP PA to analyse the ingress traffic
on an interface of an edge router. I've configured policy
simply based on IP prefix at this stage.
The CEF table is coloured with the appropriate traffic_index
but I'm finding that accounting only seems to be collected for
some classes. It seems that traffic to label switched destinations
is not accounted for.
Eg. here's the CEF statistics - notice that traffic classes
1 and 4 are zeroed out. These destinations are label switched.
Traffic classes 2 and 3 are not.
router#show cef interface policy-statistics
POS4/0 is up (if_number 8)
Corresponding hwidb fast_if_number 8
Corresponding hwidb firstsw->if_number 8
BGP based Policy accounting is enabled
Index Packets Bytes
1 0 0
2 22793933 13346561348
3 83934938 45008514252
4 0 0
5 0 0
6 0 0
7 0 0
8 40947165 7009408861
Here's the CEF detail outputs for prefixes in each traffic class.
The only difference I see is the "fast tag rewrite" on 1 and 4,
which is coincidental with the zero accounting data.
router#show ip cef 212.23.58.0 detail
212.23.58.0/24, version 103443, cached adjacency 212.23.40.5
0 packets, 0 bytes
tag information from 212.23.38.4/32, shared
local tag: 19
fast tag rewrite with Gi3/2, 212.23.40.5, tags imposed {17}
Flow: AS 0, mask 24, traffic_index 1
via 212.23.38.4, 0 dependencies, recursive
next hop 212.23.40.5, GigabitEthernet3/2 via 212.23.38.4/32
valid cached adjacency
tag rewrite with Gi3/2, 212.23.40.5, tags imposed {17}
router#show ip cef 212.23.60.0 detail
212.23.60.0/24, version 103444, cached adjacency 212.23.34.45
0 packets, 0 bytes
tag information from 212.23.34.241/32, shared
local tag: 23
Flow: AS 0, mask 24, traffic_index 2
via 212.23.34.241, 0 dependencies, recursive
next hop 212.23.34.45, GigabitEthernet3/1 via 212.23.34.241/32
valid cached adjacency
tag rewrite with Gi3/1, 212.23.34.45, tags imposed {}
router#show ip cef 212.23.40.128 detail
212.23.40.128/25, version 103442, cached adjacency 212.23.40.5
0 packets, 0 bytes
tag information from 212.23.38.4/32, shared
local tag: 19
fast tag rewrite with Gi3/2, 212.23.40.5, tags imposed {17}
Flow: AS 0, mask 25, traffic_index 4
via 212.23.38.4, 0 dependencies, recursive
next hop 212.23.40.5, GigabitEthernet3/2 via 212.23.38.4/32
valid cached adjacency
tag rewrite with Gi3/2, 212.23.40.5, tags imposed {17}
Software is IOS 12.0(16)ST on GRP but I see similar symptoms
with same version on RSP with/without dCEF. Any ideas?
-- Adam.
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:41 EDT