Hello!
I've faced with CEF adj table overflow on SUP720-3BXL when tried to import BGP Full View into VRF on PE.
The scheme is following: border router R1 (6500 SUP720-3BXL) is MPLS PE. BGP session with uplinks are configured in address-family ipv4 vrf Uplink.
I use "Per VRF label" feature for VRF Uplink due to TCAM limitations.
There is another PE router R2 (6500 SUP720-3BXL) in the network with VRF Uplink.
R2 has a problem with CEF adj table overflow because it creates adj entry for each prefix from BGP Full View instead of common entry for all traffic to R01. The content of these adj entries is identical.
Here is some output from R1 and R2:
R1#sh mls cef vrf Uplink 12.43.140.0 24 detail
Codes: M - mask entry, V - value entry, A - adjacency index, P - priority bit
D - full don't switch, m - load balancing modnumber, B - BGP Bucket sel
V0 - Vlan 0,C0 - don't comp bit 0,V1 - Vlan 1,C1 - don't comp bit 1
RVTEN - RPF Vlan table enable, RVTSEL - RPF Vlan table select
Format: IPV4_DA - (8 | xtag vpn pi cr recirc tos prefix)
Format: IPV4_SA - (9 | xtag vpn pi cr recirc prefix)
M(5446 ): E | 1 FFF 0 0 0 0 255.255.255.0
V(5446 ): 8 | 1 1 0 0 0 0 12.43.140.0 (A:360615 ,P:1,D:0,m:0 ,B:0 )
R1#sh mls cef vrf Uplink 12.43.146.0 24 detail
Codes: M - mask entry, V - value entry, A - adjacency index, P - priority bit
D - full don't switch, m - load balancing modnumber, B - BGP Bucket sel
V0 - Vlan 0,C0 - don't comp bit 0,V1 - Vlan 1,C1 - don't comp bit 1
RVTEN - RPF Vlan table enable, RVTSEL - RPF Vlan table select
Format: IPV4_DA - (8 | xtag vpn pi cr recirc tos prefix)
Format: IPV4_SA - (9 | xtag vpn pi cr recirc prefix)
M(5447 ): E | 1 FFF 0 0 0 0 255.255.255.0
V(5447 ): 8 | 1 1 0 0 0 0 12.43.146.0 (A:360615 ,P:1,D:0,m:0 ,B:0 )
R2#sh mls cef vrf Uplink 12.43.140.0 24 detail
Codes: M - mask entry, V - value entry, A - adjacency index, P - priority bit
D - full don't switch, m - load balancing modnumber, B - BGP Bucket sel
V0 - Vlan 0,C0 - don't comp bit 0,V1 - Vlan 1,C1 - don't comp bit 1
RVTEN - RPF Vlan table enable, RVTSEL - RPF Vlan table select
Format: IPV4_DA - (8 | xtag vpn pi cr recirc tos prefix)
Format: IPV4_SA - (9 | xtag vpn pi cr recirc prefix)
M(4728 ): E | 1 FFF 0 0 0 0 255.255.255.0
V(4728 ): 8 | 1 1 0 0 0 0 12.43.140.0 (A:294998 ,P:1,D:0,m:0 ,B:0 )
R2#sh mls cef vrf Uplink 12.43.146.0 24 detail
Codes: M - mask entry, V - value entry, A - adjacency index, P - priority bit
D - full don't switch, m - load balancing modnumber, B - BGP Bucket sel
V0 - Vlan 0,C0 - don't comp bit 0,V1 - Vlan 1,C1 - don't comp bit 1
RVTEN - RPF Vlan table enable, RVTSEL - RPF Vlan table select
Format: IPV4_DA - (8 | xtag vpn pi cr recirc tos prefix)
Format: IPV4_SA - (9 | xtag vpn pi cr recirc prefix)
M(4729 ): E | 1 FFF 0 0 0 0 255.255.255.0
V(4729 ): 8 | 1 1 0 0 0 0 12.43.146.0 (A:311382 ,P:1,D:0,m:0 ,B:0 )
R2#sh mls cef adjacency entry 294998 detail
Index: 294998 smac: 0002.7eb5.7000, dmac: 00d0.01f9.c000
mtu: 9018, vlan: 1020, dindex: 0x0, l3rw_vld: 1
format: MPLS, flags: 0x8418
label0: 0, exp: 0, ovr: 0
label1: 16, exp: 0, ovr: 0
label2: 453, exp: 0, ovr: 0
op: PUSH_LABEL2_LABEL1
packets: 0, bytes: 0
R2#sh mls cef adjacency entry 311382 detail
Index: 311382 smac: 0002.7eb5.7000, dmac: 00d0.01f9.c000
mtu: 9018, vlan: 1020, dindex: 0x0, l3rw_vld: 1
format: MPLS, flags: 0x8418
label0: 0, exp: 0, ovr: 0
label1: 16, exp: 0, ovr: 0
label2: 453, exp: 0, ovr: 0
op: PUSH_LABEL2_LABEL1
packets: 0, bytes: 0
It seems to me that 6500 need 1 adj entry for 1 FEC and it can't summarize all traffic with defined label to 1 FEC. Am i right?
