The section filter of the show commands contains a nasty bug (at least in the IOS release 12.4T) in IOS release 12.2SRC: if a line in the section matches the same regular expression as the section header, the rest of the section is not printed. I guess this sounds a bit perplexing, so here's an example. When using the router bgp regular expression in a section filter appended to the show running command, the whole BGP configuration is displayed:

PE-A#show run ¦ section router bgp
router bgp 65000
 template peer-policy Internal
  send-community both
 exit-peer-policy
 !
 template peer-session Internal
  remote-as 65000
  update-source Loopback0
 exit-peer-session
 !
 no synchronization
 bgp log-neighbor-changes
 neighbor 10.0.1.5 inherit peer-session Internal
 neighbor 10.0.1.5 description PE-C(RR)
 neighbor 10.0.1.5 inherit peer-policy Internal
 no auto-summary
 !
 address-family vpnv4
  neighbor 10.0.1.5 activate
  neighbor 10.0.1.5 send-community extended
 exit-address-family

However, if you use bgp as the regular expression, the printout starts with the router bgp command, but stops abruptly after the first line containing the string bgp, skipping the rest of the section:

PE-A#show run ¦ section bgp
router bgp 65000
 template peer-policy Internal
  send-community both
 exit-peer-policy
 !
 template peer-session Internal
  remote-as 65000
  update-source Loopback0
 exit-peer-session
 !
 no synchronization
 bgp log-neighbor-changes