Hi there,
we are migrating our "old" MPLS-Backbone to Catalyst 9500 / 9300. During this Migration we remarked, that the neighbors (Catalyst 6500 and 6880) are increasing the giants count… I hope somebody can help finding out what is going wrong. Thanks!
The following IOS-Versions and Platforms are used:
- Catalyst C9500-24Y4C
- Cisco IOS Software [Gibraltar], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.12.02, RELEASE SOFTWARE (fc2)
- Catalyst C9300-24P-A
- Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.6.5, RELEASE SOFTWARE (fc3)
- Catalyst WS-C6506-E
- Cisco IOS Software, s72033_rp Software (s72033_rp-ADVIPSERVICESK9-M), Version 15.1(2)SY11, RELEASE SOFTWARE (fc3)
- Catalyst C6880-X-LE
- Cisco IOS Software, c6880x Software (c6880x-ADVENTERPRISEK9-M), Version 15.2(1)SY7, RELEASE SOFTWARE (fc1)
It looks like this (RTR-1 can be either Catalyst 9300 or 9500 [in this case C9500-24Y4C], RTR-2 can be either Catalyst 6500 or 6880 [in this case WS-C6506-E]
-------------------------------------------------------------------------------------------------------
RTR-2 (Catalyst 6500 or 6880)
---------------------------------------------------------------------------------------------
RTR-2#sho int po100
Port-channel100 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 0024.14a6.0d80 (bia 0024.14a6.0d80)
Description: WAN to RTR-1 [Po100] <ms>
Internet address is 10.1.1.2/30
MTU 9198 bytes, BW 10000000 Kbit, DLY 10 usec,
reliability 255/255, txload 2/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, media type is unknown
input flow-control is on, output flow-control is off
Members in this channel: Te3/3
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 29439000 bits/sec, 6777 packets/sec
5 minute output rate 83634000 bits/sec, 10251 packets/sec
L2 Switched: ucast: 8133999 pkt, 607113126 bytes - mcast: 31061663 pkt, 3877286028 bytes
L3 in Switched: ucast: 58507336931 pkt, 27814824957527 bytes - mcast: 0 pkt, 0 bytes mcast
L3 out Switched: ucast: 79029338746 pkt, 58326116108186 bytes mcast: 0 pkt, 0 bytes
58544738849 packets input, 27817362680710 bytes, 0 no buffer
Received 33956109 broadcasts (0 IP multicasts)
0 runts, 431330790 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
79062339770 packets output, 58232331329668 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
RTR-2#sho int po100 mtu
Port Name MTU
Po100 WAN to RTR-1 [Po10 9198
RTR-2#
RTR-2#ho runn int po100
Building configuration...
Current configuration : 309 bytes
!
interface Port-channel100
description WAN to RTR-1 [Po100] <ms>
mtu 9198
ip address 10.1.1.2 255.255.255.252
ip ospf authentication null
ip ospf network point-to-point
ip ospf dead-interval 3
ip ospf hello-interval 1
logging event link-status
logging event bundle-status
mpls ip
end
RTR-2#sho etherch 100 sum
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use N - not in use, no aggregation
f - failed to allocate aggregator
M - not in use, no aggregation due to minimum links not met
m - not in use, port not aggregated due to minimum links not met
u - unsuitable for bundling
d - default port
w - waiting to be aggregated
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
100 Po100(RU) LACP Te3/3(P)
Last applied Hash Distribution Algorithm: Fixed
RTR-2#sho runn int te3/3
Building configuration...
Current configuration : 238 bytes
!
interface TenGigabitEthernet3/3
description WAN to RTR-1 [Twe1/0/24] <m>
mtu 9198
no ip address
logging event link-status
logging event bundle-status
logging event spanning-tree status
channel-group 100 mode active
end
RTR-2#sho interface TenGigabitEthernet3/3 mtu
Port Name MTU
Te3/3 WAN to RTR-1 [Twe 9198
RTR-2#
-------------------------------------------------------------------------------------------------------
RTR-1 (Catalyst 9500 or 9300)
---------------------------------------------------------------------------------------------
RTR-1#sho int po100
Port-channel100 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 6c8b.d348.f31f (bia 6c8b.d348.f31f)
Description: WAN to RTR-2 [Po100] <ms>
Internet address is 10.1.1.1/30
MTU 9198 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 10Gb/s, link type is auto, media type is N/A
input flow-control is on, output flow-control is unsupported
Members in this channel: Twe1/0/24
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 84369000 bits/sec, 10501 packets/sec
5 minute output rate 21932000 bits/sec, 6279 packets/sec
17127158611 packets input, 14334176858857 bytes, 0 no buffer
Received 9042101 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 9042100 multicast, 0 pause input
0 input packets with dribble condition detected
11829227138 packets output, 5568097929729 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
RTR-1#
RTR-1#sho int po100 mtu
Port Name MTU
Po100 WAN to RTR-2 [Po10 9198
RTR-1#
RTR-1#sho system mtu
Global Ethernet MTU is 9198 bytes.
RTR-1#
RTR-1#sho runn int po100
Building configuration...
Current configuration : 258 bytes
!
interface Port-channel100
description WAN to RTR-2 [Po100] <ms>
no switchport
ip address 10.1.1.1 255.255.255.252
ip ospf network point-to-point
ip ospf dead-interval 3
ip ospf hello-interval 1
logging event bundle-status
mpls ip
end
RTR-1#sho etherch 100 summ
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
A - formed by Auto LAG
Number of channel-groups in use: 17
Number of aggregators: 17
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
100 Po100(RU) LACP Twe1/0/24(P)
RTR-1#sho runn int twe1/0/24
Building configuration...
Current configuration : 209 bytes
!
interface TwentyFiveGigE1/0/24
description WAN to RTR-1 [Te3/3] <m>
no switchport
no ip address
logging event bundle-status
channel-group 100 mode active
service-policy output PM_QOS-OUT
end
RTR-1#sho interface TwentyFiveGigE1/0/24 mtu
Port Name MTU
Twe1/0/24 WAN to RTR-1 [Te3/ 9198
RTR-1#
