Hello.
I'm doing DMZ-Link BW in IOS XR and IOS XE as my internet facing router in the lab. For IOS, the bandwidth is 1024kbps and for XR it is 256k.
Configurations below (I removed all unnecessary configs)
R1 (XE)
interface Ethernet0/2
bandwidth 1024
ip address 192.1.4.1 255.255.255.0
router bgp 100
bgp dmzlink-bw
neighbor 192.1.4.4 dmzlink-bw
XRv10 (XR)
interface GigabitEthernet0/0/0/2
bandwidth 256
ipv4 address 192.4.10.10 255.255.255.0
router bgp 100
neighbor 192.4.10.4
remote-as 400
dmz-link-bandwidth
The route is being advertised to an internal router but the bandwidth that can be seen from XR is wrong. So even if the XE path has larger interface bandwidth, the traffic-share count on R3 favors XRv10 path with a significant difference. I know it can be configured using extcommunity-set but trying to figure out the straightforward approach.
R3#show bgp 172.17.255.44
BGP routing table entry for 172.17.255.44/32, version 29
Paths: (2 available, best #1, table default)
Multipath: iBGP
Not advertised to any peer
Refresh Epoch 2
400
192.168.255.1 (metric 11) from 192.168.255.1 (192.168.255.1)
Origin IGP, metric 0, localpref 100, valid, internal, multipath, best
DMZ-Link Bw 128 kbytes
rx pathid: 0, tx pathid: 0x0
Refresh Epoch 1
400
192.168.255.10 (metric 11) from 192.168.255.10 (192.168.255.10)
Origin IGP, metric 0, localpref 100, valid, internal, multipath(oldest)
DMZ-Link Bw 32000 kbytes
rx pathid: 0, tx pathid: 0
R3#show ip route 172.17.255.44
Routing entry for 172.17.255.44/32
Known via "bgp 100", distance 200, metric 0
Tag 400, type internal
Last update from 192.168.255.10 00:20:42 ago
Routing Descriptor Blocks:
192.168.255.10, from 192.168.255.10, 00:20:42 ago
Route metric is 0, traffic share count is 240
AS Hops 1
Route tag 400
MPLS label: none
* 192.168.255.1, from 192.168.255.1, 00:20:42 ago
Route metric is 0, traffic share count is 1
AS Hops 1
Route tag 400
MPLS label: none
############Interface BW###############
RP/0/0/CPU0:XRv10#sh int gi0/0/0/2 | i BW
Thu Apr 14 17:40:07.810 UTC
MTU 1514 bytes, BW 256 Kbit (Max: 1000000 Kbit)
RP/0/0/CPU0:XRv10#
R1#sh int eth0/2 | i BW
MTU 1500 bytes, BW 1024 Kbit/sec, DLY 1000 usec,
R1#
